What does HSV 2 IgG, Type Specific Ab — Reactive mean?

This is the full label format used by most labs for a positive HSV-2 IgG blood test. Breaking it down: "HSV 2" is herpes simplex virus type 2; "IgG" is the class of antibody being measured (immunoglobulin G — the long-lasting antibody); "Type Specific Ab" means the test specifically detects HSV-2 antibodies and distinguishes them from HSV-1 (using the gG-2 glycoprotein); "Reactive" means antibodies were detected above the threshold. Together: HSV-2 antibodies were found in your blood, indicating prior exposure to HSV-2.

What does HSV 2 Non Reactive mean?

Non Reactive is the serological term for a negative result. It means the test did not detect HSV-2 IgG antibodies above the detection threshold — you do not have evidence of prior HSV-2 infection at the time of testing. This is the expected result for people who have not been exposed to HSV-2. Important caveat: if you had a potential exposure within the past 12–16 weeks, a Non Reactive result may not yet be reliable — antibodies take time to develop after initial infection. Retest at 12–16 weeks post-exposure for a definitive result.

What does Reactive Abnormal mean on an HSV-2 test?

"Reactive Abnormal" (sometimes displayed as ">Reactive< Abnormal" or "HSV-2 Reactive — Abnormal") means the same thing as a Reactive result. The word "Abnormal" is the lab system's automated flag indicating the result is outside the reference interval — which for HSV-2 IgG is "Non Reactive." So "Abnormal" simply means the result is not the expected negative; it does not indicate how severe the infection is or that anything unusually serious has occurred. The clinically meaningful word is "Reactive."

What does equivocal mean on a herpes test?

Equivocal means the result fell in the borderline zone — the index value was too high to be clearly negative but not high enough to be confidently called positive. For most HSV-2 IgG assays, equivocal is defined as an index value between 0.90 and 1.09. An equivocal result cannot be interpreted as positive or negative. In most people with no known exposure and no symptoms, an equivocal result resolves to Non Reactive on repeat testing several weeks later. If equivocal results persist, the HSV-2 Western Blot or Inhibition assay (the supplemental test) can provide a definitive answer.

Is a Reactive HSV-2 IgG result always accurate?

No — particularly at low index values. Low-positive results (index values between 1.1 and 3.5) have substantially lower specificity, and false positives are well documented in this range. The CDC and IDSA guidelines recommend confirmatory testing with the HSV-2 Western Blot or Inhibition assay before making clinical decisions based on a low-positive IgG result. Results with an index value above 3.5 are more reliable but still not 100% accurate.

What does the HSV-2 IgG supplemental test or inhibition assay mean?

The supplemental test (also called the Inhibition assay, Biokit HSV-2, or HSV-2 Confirm) is a follow-up test used to determine whether a low-positive or equivocal HSV-2 IgG result is a true positive or a false positive. When your lab report says "HSV-2 IgG, Type Spec — Reactive" followed by "W/Refl HSV-2 Inhibition" or "HSV-2 IgG Inhibition IA," this means the lab automatically ran the supplemental test because your initial result fell in a range that requires confirmation. If the inhibition assay is also positive, the result is more likely a true positive. If the inhibition assay is negative, the initial reactive result may be a false positive — and HSV-2 Western Blot testing may be recommended for definitive confirmation.

What is the difference between HSV-1 and HSV-2 IgG tests?

HSV-1 and HSV-2 are both herpes simplex viruses but typically affect different areas of the body. HSV-1 most commonly causes oral herpes (cold sores); HSV-2 most commonly causes genital herpes — though either type can occur at either location. The IgG blood test can detect antibodies to each type separately using type-specific assays (based on the gG-1 and gG-2 glycoproteins). A positive HSV-1 IgG with a Non Reactive HSV-2 IgG means you have been exposed to oral herpes but not genital herpes type 2. A positive HSV-2 IgG regardless of HSV-1 status means exposure to the type that most commonly causes genital herpes.

Can I have HSV-2 and test Non Reactive?

Yes — in two specific situations. First, if you were tested within 12–16 weeks of initial infection, your immune system may not yet have produced detectable IgG antibodies (the window period). Second, extremely rarely, some individuals with HSV-2 infection may not mount a detectable antibody response, though this is uncommon. If you have symptoms consistent with herpes but a Non Reactive blood test, a swab or PCR test of an active lesion is more sensitive for diagnosing current infection than a blood antibody test.

What does a high HSV-2 IgG level mean?

The absolute number of your HSV-2 IgG index value does not indicate how severe the infection is, how long you have been infected, or how contagious you are. Once the result crosses into the Reactive range (index above 1.10 or 3.5 depending on the assay), a higher number does not convey additional clinical meaning in most contexts. IgG levels fluctuate over time and do not correlate with outbreak frequency, viral shedding, or transmission risk in any clinically validated way.

What does "HSV 2 IgG, Type Spec — Non Reactive" mean on HealthMatters?

This is the format HealthMatters displays for a negative HSV-2 IgG result. "HSV 2 IgG, Type Spec" is the test name — the type-specific herpes simplex virus 2 immunoglobulin G antibody test. "Non Reactive" is the result — meaning no HSV-2 antibodies were detected. This is the expected, normal result for someone who has not been exposed to HSV-2.

Can HSV-2 IgG antibodies become negative over time?

In the vast majority of cases, no. Once established, HSV-2 IgG antibodies persist for life and do not become negative. This is why the test is useful as a marker of prior exposure — a Reactive result from years ago typically remains Reactive indefinitely. However, there are a few situations where apparent changes can occur: if a previous result was a false positive (particularly a low-positive index value of 1.1–3.49), a repeat test or confirmatory test may come back negative — not because the antibodies disappeared, but because the first result was not a true positive. Very rarely, people with immunosuppression may have fluctuating antibody levels. If your HSV-2 IgG result has changed from Reactive to Non Reactive or equivocal, the most likely explanation is that one of the results was a borderline or false positive, particularly if the original index value was in the low-positive range.

Should I tell my partner if my HSV-2 IgG is positive?

Partner disclosure is a personal decision that depends on the reliability of your result and your relationship context, but it is generally recommended. If your HSV-2 IgG result is clearly positive (index value above 3.5, or confirmed by supplemental testing), disclosing to sexual partners allows them to make informed decisions about their own testing and protection. Most sexual health clinicians recommend disclosure. If your result is a low-positive (index 1.1–3.49) that has not yet been confirmed, completing confirmatory testing first is reasonable before making disclosure decisions — though this should not be used as a reason to delay indefinitely. Importantly, many people with HSV-2 transmit the virus without symptoms (through asymptomatic shedding), which is why disclosure and discussion of risk-reduction strategies (antiviral suppressive therapy, condom use) are clinically meaningful even in the absence of recognized outbreaks.

Can HSV-2 affect pregnancy?

Yes — HSV-2 is an important consideration during pregnancy, though most HSV-2-seropositive pregnancies proceed without complications when properly managed. The primary concern is neonatal herpes — a serious condition that can occur if the virus is transmitted to the baby during delivery, most commonly when a mother has a primary (first) genital herpes infection late in pregnancy. The risk is highest with a new infection acquired during the third trimester. For people with established HSV-2 infection (meaning a pre-existing positive IgG result), the risk of neonatal transmission during delivery is substantially lower because maternal antibodies provide some protection to the baby. Antiviral suppressive therapy (typically acyclovir or valacyclovir) from 36 weeks of pregnancy can further reduce the risk of outbreak at delivery. A positive HSV-2 IgG in pregnancy should be discussed with your OB/midwife — it does not automatically require a cesarean delivery or mean your baby is at high risk.

HSV-2 IgG Blood Test: What Reactive, Non Reactive, and Equivocal Results Mean

Serum

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Reference range:

Sexually Transmitted Disease (STD) panel Clinical Pathology Laboratories

From Healthmatters.io Team and reviewed by HM Editorial Team

Written on June 18, 2026 | Last updated Updated on June 18, 2026

Lab Results Explained and Tracked

QUICK ANSWER

HSV-2 IgG detects antibodies to herpes simplex virus type 2. The test uses different terminology from standard "positive/negative" — here is what each result means:

Result on your report	What it means
Non Reactive	No HSV-2 antibodies detected — the standard "negative" result
Reactive	HSV-2 antibodies detected — indicates prior exposure to HSV-2
Reactive Abnormal	Same as Reactive — "Abnormal" is the lab flag; the meaningful word is "Reactive"
Equivocal	Borderline — the result is in the indeterminate range; a repeat test is needed
Positive	Same as Reactive — some labs use "Positive" instead of "Reactive"
Negative	Same as Non Reactive — some labs use "Negative" instead of "Non Reactive"

Common questions at a glance:

Question	Short answer
Does "Reactive" mean I have herpes?	It means HSV-2 antibodies were detected. The test has limitations — particularly at low index values — so clinical confirmation may be needed
Does "Non Reactive" mean I definitely don't have HSV-2?	Not with complete certainty — there is a window period after exposure where antibodies have not yet developed; retest if recent exposure
What does "HSV 2 IgG, Type Specific Ab — Reactive" mean?	This is the full lab report label for a positive HSV-2 IgG test result
What does equivocal mean on a herpes test?	The result fell in the borderline zone (typically index 0.90–1.09) — neither clearly positive nor negative; repeat testing required
Is a Reactive HSV-2 IgG always accurate?	No — false positives occur, especially at low index values (1.1–3.5); the supplemental/inhibition test can confirm

WHAT IS "REACTIVE" AND "NON REACTIVE"? — READING YOUR RESULT

Most herpes IgG blood tests do not report simply "Positive" or "Negative." They use the terms Reactive and Non Reactive — which are serological terminology for the same concepts:

Lab report term	Meaning	Clinical interpretation
Non Reactive	No antibodies detected above threshold	Negative — no evidence of prior HSV-2 exposure
Reactive	Antibodies detected above threshold	Positive — HSV-2 antibodies present; prior exposure indicated
Reactive / Abnormal	Same as Reactive — "Abnormal" is the lab system's flag	The word "Abnormal" means the result is outside the reference interval (Non Reactive); it does not indicate severity
Equivocal	Result in the borderline zone	Indeterminate — neither clearly positive nor negative; repeat testing needed
Reference Interval: Non Reactive	The normal/expected result for this test	If your result says something other than Non Reactive, antibodies were detected

Why "Reactive" instead of "Positive"? Serology tests (tests that detect antibodies in serum/blood) conventionally use Reactive/Non Reactive rather than Positive/Negative because the reaction being measured is a chemical antibody-antigen reaction, not a binary present/absent finding. The terms are functionally equivalent.

YOUR HSV-2 IgG INDEX VALUE — WHAT DOES YOUR NUMBER MEAN?

Most labs report HSV-2 IgG as a numeric index value (also called an index ratio or signal-to-cutoff ratio), not just a word. This number tells you how far above or below the detection threshold your result falls:

Index value	Result category	Interpretation
Below 0.90	Non Reactive (Negative)	No HSV-2 antibodies detected; standard negative result
0.90–1.09	Equivocal	Borderline — in the indeterminate zone; cannot be interpreted as positive or negative; repeat in 4–6 weeks
1.10–3.49	Reactive (Low Positive)	Antibodies detected — but this range has a significant false positive rate; supplemental testing strongly recommended before clinical decisions are made
3.50 and above	Reactive (Positive)	Antibodies detected at a level associated with true HSV-2 infection; false positives less common at this level

The most important clinical fact about low positive results: Low-positive results (particularly index values in the 1.1–3.49 range) have substantially lower specificity and may require confirmatory testing because false positives are well documented in this range. The CDC and IDSA guidelines specifically note that index values below 3.5 may not indicate true HSV-2 infection and should be confirmed with a supplemental test (the HSV-2 Western Blot or the Inhibition/Biokit assay) before clinical conclusions are drawn.

What does 0.90 mean on an HSV test? An index value of exactly 0.90 falls at the bottom of the equivocal zone in most assays. Depending on your lab's specific cutoffs, this may be reported as Non Reactive (below 0.90) or Equivocal (0.90–1.09). Check your report's stated reference range — if 0.90 is listed as "Non Reactive" on your report, it is a negative result by that lab's criteria.

WHAT DOES REACTIVE MEAN? — HSV-2 IgG REACTIVE EXPLAINED

A Reactive HSV-2 IgG result means the test detected IgG antibodies to herpes simplex virus type 2 in your blood. IgG antibodies develop after exposure to HSV-2 — typically within 12 weeks of initial infection — and persist for life in people who have been infected.

What a Reactive result tells you:

HSV-2 antibodies are present in your blood
You have been exposed to HSV-2 at some point in your life
The test cannot tell you when the infection occurred (could be recent or decades ago)
The test cannot tell you whether the infection is active or producing symptoms

What a Reactive result does not tell you:

Whether you currently have an active outbreak
When you were first infected
Whether you are likely to transmit the virus to a partner (transmission risk is separate from antibody status)
Whether the result is accurate (particularly at low index values — see above)

Can a Reactive HSV-2 IgG result be wrong? Yes. False positives occur, particularly in:

Low-index results (index value 1.10–3.49)
People with other autoimmune conditions
People who have received certain vaccines
Labs using older ELISA assays

If your result is Reactive with an index value below 3.5 and you have no symptoms or known exposure history, confirmatory testing with the HSV-2 Western Blot (the gold standard) or Inhibition assay is strongly recommended before making clinical decisions.

WHAT DOES NON REACTIVE MEAN? — HSV-2 IgG NON REACTIVE EXPLAINED

A Non Reactive HSV-2 IgG result means the test did not detect HSV-2 antibodies above the threshold — this is the standard negative result.

What a Non Reactive result tells you:

No HSV-2 IgG antibodies were detected at the time of testing
This is the expected result for people who have not been exposed to HSV-2

What a Non Reactive result does not guarantee:

That you have never been exposed — the test has a window period of approximately 12–16 weeks after initial infection before reliable antibodies develop
If you had a potential exposure within the past 12–16 weeks, a Non Reactive result may not yet reflect a recent infection — retest at 12–16 weeks post-exposure for a reliable result

HSV-2 Non Reactive with symptoms? If you have symptoms that could be consistent with herpes (genital ulcers, blisters, sores) but your IgG blood test is Non Reactive, the discrepancy may be because:

The infection is too recent for IgG antibodies to develop
The symptoms are caused by HSV-1 (which requires a separate HSV-1 IgG test)
The symptoms have a different cause entirely
A swab test (PCR or culture) of an active lesion is more accurate than blood testing for diagnosing current outbreaks

WHAT DOES EQUIVOCAL MEAN ON AN HSV-2 TEST?

An Equivocal HSV-2 IgG result means the test fell in the borderline zone — too high to be clearly negative, but not high enough to be confidently called positive. This result cannot be interpreted as either positive or negative.

Standard equivocal ranges:

Assay	Non Reactive	Equivocal	Reactive
HerpeSelect 2 IgG (Focus Diagnostics)	Below 0.90	0.90–1.09	1.10 and above
Roche Elecsys HSV-2 IgG	Below 0.90	0.90–1.09	1.10 and above
Biokit HSV-2	Below 0.90	0.90–1.10	Above 1.10

What does an equivocal result mean clinically?

Most equivocal HSV-2 IgG results resolve to Non Reactive (negative) on repeat testing. However, some represent true early seroconversion — the early period when antibodies are just beginning to develop after a new infection.

Equivocal result scenario	What it likely means	What to do
No known exposure, no symptoms	Most commonly a non-specific reaction or borderline result	Repeat in 4–6 weeks; most resolve to Non Reactive
Known recent exposure (within 12 weeks)	Could represent early seroconversion	Repeat at 12–16 weeks post-exposure for definitive result
Symptoms consistent with herpes	Possible early infection	Swab test of active lesion is more diagnostic; repeat IgG in 6–8 weeks
Persistent equivocal on repeat testing	Requires clarification	HSV-2 Western Blot or Inhibition assay (supplemental test) is the next step

THE SUPPLEMENTAL TEST — HSV-2 IgG INHIBITION ASSAY / WESTERN BLOT

When a low-positive or equivocal HSV-2 IgG result is unclear, a supplemental test is used to confirm or rule out the result. This is what "W/Refl HSV-2 Inhibition" means on your lab report — the lab automatically orders the supplemental test if the initial result falls in a specified range.

Two main supplemental tests:

Test	How it works	What it tells you
HSV-2 Inhibition Assay (Biokit/Confirm)	Measures whether HSV-2-specific antigen inhibits the antibody signal — true positives are inhibited, false positives are not	Highly specific; used to distinguish true positives from false positives in the 1.1–3.5 index range
HSV-2 Western Blot (University of Washington)	The gold standard reference test; detects antibodies against specific HSV-2 proteins	Most accurate available test; used to resolve equivocal or low-positive IgG results; available through specialty labs

What does "HSV-2 IgG Inhibition IA Positive" mean? The supplemental inhibition assay came back positive — meaning the low-positive IgG result was confirmed as a true positive, not a false positive. This significantly increases the likelihood that the initial reactive result reflects true HSV-2 infection.

What if the initial IgG is positive but the inhibition assay is negative? This pattern suggests the initial IgG result was likely a false positive. In this scenario, HSV-2 Western Blot testing may be recommended to provide a definitive answer.

IgG VS IgM — WHICH TEST IS WHICH?

Many people are confused about why they received an IgG test rather than an IgM test, or why both are ordered. Here is the key difference:

Test	What it detects	When it appears	Clinical use
HSV-2 IgG	Long-lasting antibodies that develop after initial infection	Typically 12–16 weeks after initial infection; persist lifelong	Standard test for determining HSV-2 status; not useful for diagnosing very recent infection
HSV-2 IgM	Early antibodies that appear shortly after infection	Appears within days to weeks of infection; fades over time	Unreliable for herpes diagnosis — high false positive rate; cross-reactivity with HSV-1; NOT recommended by CDC or IDSA for HSV diagnosis

Important: If your doctor ordered an HSV-2 IgM test, you should know this test is not recommended for routine herpes diagnosis due to poor specificity. A positive HSV-2 IgM result does not reliably indicate recent HSV-2 infection. The HSV-2 IgG is the clinically validated test.

TEST ACCURACY AND LIMITATIONS

The HSV-2 IgG test is useful but has important limitations that every patient should understand:

Limitation	Details
Window period	Takes 12–16 weeks after infection for reliable IgG levels to develop; testing too early after exposure can produce a false negative
False positives at low index values	Low-positive index values (1.10–3.49) have substantially lower specificity and may require confirmatory testing because false positives are well documented in this range
Cannot determine timing	A Reactive result does not indicate when infection occurred — could be recent or from years or decades ago
Cannot predict symptoms	Many people with positive HSV-2 IgG never develop recognized symptoms; a positive test does not mean you will have outbreaks
Cannot assess transmissibility	Antibody status does not directly indicate current viral shedding or transmission risk
HSV-1 cross-reactivity	Very rare with type-specific (gG-based) assays; older non-type-specific assays can cross-react with HSV-1 antibodies
Assay variation	Different labs use different assays (HerpeSelect, Roche Elecsys, Biokit) with slightly different thresholds and performance characteristics

WHAT DOES MY EXACT HSV-2 IgG INDEX VALUE MEAN?

Your index value	Result category	Interpretation
Below 0.20	Non Reactive	Clearly negative — well below threshold
0.20–0.89	Non Reactive	Negative — no HSV-2 antibodies detected
0.90–1.09	Equivocal	Borderline — repeat in 4–6 weeks; most resolve to negative
1.10–1.49	Reactive (Low Positive)	Low positive — specificity substantially lower in this range; confirmatory testing strongly recommended
1.50–2.49	Reactive (Low Positive)	Low positive — false positives well documented in this range; supplemental test or Western Blot recommended
2.50–3.49	Reactive (Low Positive)	Low positive — confirmatory testing still advised before clinical conclusions are drawn
3.50–4.99	Reactive	Above traditional confirmation threshold; more likely true positive, though confirmatory testing still available
5.00–8.00	Reactive	Higher positive — more reliable indication of true HSV-2 infection
Above 8.00	Reactive (High Positive)	High positive — strong indication of HSV-2 infection; false positives uncommon at this level

Important: The index value does not indicate how long you have been infected, how severe the infection is, or how likely you are to have outbreaks. Once in the Reactive range, the number itself has no additional clinical significance beyond distinguishing low-positive (confirmation recommended) from higher-positive (more reliable) ranges.

SEROCONVERSION TIMELINE — WHEN DOES THE TEST BECOME RELIABLE?

IgG antibodies take time to develop after initial HSV-2 infection. Testing too early after a potential exposure can produce a false negative even if infection occurred:

Time after initial exposure	Likelihood of detectable IgG antibodies
1–2 weeks	Usually Non Reactive even if infected — antibodies not yet developed
4 weeks	Many people still Non Reactive — too early for reliable testing
6–8 weeks	Majority of infected individuals beginning to seroconvert
12 weeks	Most HSV-2 infections detectable by IgG testing
16 weeks	Highly reliable — the recommended window for definitive testing after potential exposure
6 months	Virtually all infections detectable — used in some guidelines as the final confirmation window

Key implication: A Non Reactive result obtained within 12 weeks of a potential exposure does not definitively rule out HSV-2 infection. Retest at 16 weeks for a reliable result. A Non Reactive result obtained 4+ months after the most recent potential exposure is highly reliable.

HSV-1 + HSV-2 IgG COMBINED INTERPRETATION

Many patients receive both HSV-1 IgG and HSV-2 IgG results at the same time. Interpreting them together gives a more complete picture:

HSV-1 IgG	HSV-2 IgG	Interpretation
Non Reactive	Non Reactive	No prior exposure to HSV-1 or HSV-2 detected
Reactive	Non Reactive	Prior HSV-1 exposure (most commonly oral herpes) — no evidence of HSV-2
Non Reactive	Reactive	Prior HSV-2 exposure — no evidence of HSV-1
Reactive	Reactive	Prior exposure to both HSV-1 and HSV-2
Non Reactive	Equivocal	HSV-2 result is borderline — repeat; no prior HSV-1 detected
Reactive	Low Positive (1.10–3.49)	HSV-1 positive with low-positive HSV-2 — note: prior HSV-1 infection increases risk of false positive on some HSV-2 assays; confirmatory testing particularly important in this pattern

Clinical note on HSV-1 and low HSV-2 positives: Prior HSV-1 infection can occasionally cross-react on some older or less specific HSV-2 assays, contributing to low-positive HSV-2 results. This is less common with modern type-specific (gG-based) assays but is worth noting if you have a clearly Reactive HSV-1 result alongside a low-positive HSV-2 result.

SYMPTOMS THAT MAY BE CONSISTENT WITH HSV-2

Many people with a Reactive HSV-2 IgG result have never had recognized symptoms — this is common. Others are trying to determine whether their symptoms could be herpes-related:

Symptom	Consistent with HSV-2?	Notes
Painful genital blisters or vesicles	Yes — classic	Most characteristic presentation; may appear as small fluid-filled bumps
Genital ulcers or open sores	Yes — classic	Blisters that rupture leave shallow painful ulcers
Tingling, burning, or itching before an outbreak (prodrome)	Yes — highly characteristic	Many people recognize a warning sensation before lesions appear
Fever, body aches, headache (during first outbreak)	Yes — common with primary infection	Constitutional symptoms more prominent with initial infection than recurrences
Painful urination during outbreak	Yes — common	Urine contact with lesions or urethral involvement
Swollen lymph nodes in groin (during first outbreak)	Yes — common	Inguinal lymphadenopathy common with primary genital herpes
Recurrent pain or tingling in same area without visible lesions	Yes — subclinical reactivation	HSV-2 can reactivate without visible sores
Genital discharge alone (no lesions)	Not typical of HSV-2 alone	More commonly bacterial or yeast; discharge with lesions is possible
Urinary burning alone (no lesions)	Not specific	Could be UTI, urethritis, or other cause; not diagnostic of HSV-2
No symptoms at all	Very common	Estimated 80% of HSV-2 seropositive individuals have unrecognized or asymptomatic infection

Important: A positive HSV-2 IgG test cannot tell you whether your symptoms are caused by HSV-2. If you have active lesions, a swab or PCR test of the lesion is far more accurate for diagnosing the cause of a current outbreak than a blood antibody test.

MOST COMMON CLINICAL SCENARIOS

Pattern	Most likely interpretation	Recommended next step
Non Reactive + no symptoms + no recent exposure	No HSV-2 antibodies; standard negative	Routine STI screening per guidelines
Non Reactive + recent potential exposure (within 12 weeks)	May be in window period	Retest at 12–16 weeks post-exposure
Reactive + index value above 3.5 + no prior testing	HSV-2 antibodies confirmed with high reliability	Discuss with doctor; consider antiviral suppression if indicated
Reactive + index value 1.10–3.49 + no symptoms	Low positive — false positive possible	Supplemental test (inhibition assay or Western Blot) before making clinical decisions
Equivocal (0.90–1.09) + no symptoms	Borderline — most likely to resolve to negative	Repeat IgG in 4–6 weeks; Western Blot if persistent
Reactive + symptoms of genital herpes	Positive test with consistent symptoms	Clinical diagnosis + IgG together; antiviral treatment appropriate
Non Reactive + active genital sores/blisters	Possible early infection or HSV-1	Swab/PCR test of active lesion; HSV-1 IgG; repeat HSV-2 IgG in 12–16 weeks
HSV-2 IgG Reactive + Inhibition IA Positive	Supplemental test confirmed true positive	High confidence in HSV-2 diagnosis
HSV-2 IgG Reactive + Inhibition IA Negative	Supplemental test suggests false positive	HSV-2 Western Blot for definitive answer

MOST COMMON HSV-2 IgG RESULTS

Result on your report	Typical meaning
Non Reactive / 0.08	Clearly negative — well below threshold
Non Reactive / 0.20	Negative
Non Reactive / 0.70	Negative — approaching but still below equivocal zone
Equivocal / 0.95	Borderline — repeat in 4–6 weeks; most resolve to negative
Reactive / 1.20	Low positive — confirmatory testing strongly recommended
Reactive / 2.00	Low positive — false positives well documented; supplemental test recommended
Reactive / 3.20	Low positive approaching confirmation threshold; supplemental testing still advised
Reactive / 4.00	Positive above traditional 3.5 threshold; more reliable indication of true infection
Reactive / 8.00	Strong positive — false positives uncommon at this level

WHEN SHOULD I RETEST?

Situation	When to retest
Possible exposure less than 12 weeks ago	Retest at 12–16 weeks post-exposure for reliable result
Equivocal result with no symptoms	Retest in 4–6 weeks — most equivocal results resolve to Non Reactive
Low-positive result (index 1.10–3.49) without symptoms or known exposure	Supplemental test (inhibition/Western Blot) rather than repeat standard IgG
Non Reactive result with ongoing symptoms	Swab test of active lesion; retest IgG if primary infection suspected
Confirmed positive — routine monitoring	Not required — IgG levels persist lifelong; repeat testing does not add clinical value

FAQ about Herpes Simplex 2 Ab, IgG

What does HSV 2 IgG, Type Specific Ab — Reactive mean?

This is the full label format used by most labs for a positive HSV-2 IgG blood test. Breaking it down: "HSV 2" is herpes simplex virus type 2; "IgG" is the class of antibody being measured (immunoglobulin G — the long-lasting antibody); "Type Specific Ab" means the test specifically detects HSV-2 antibodies and distinguishes them from HSV-1 (using the gG-2 glycoprotein); "Reactive" means antibodies were detected above the threshold. Together: HSV-2 antibodies were found in your blood, indicating prior exposure to HSV-2.
What does HSV 2 Non Reactive mean?

Non Reactive is the serological term for a negative result. It means the test did not detect HSV-2 IgG antibodies above the detection threshold — you do not have evidence of prior HSV-2 infection at the time of testing. This is the expected result for people who have not been exposed to HSV-2. Important caveat: if you had a potential exposure within the past 12–16 weeks, a Non Reactive result may not yet be reliable — antibodies take time to develop after initial infection. Retest at 12–16 weeks post-exposure for a definitive result.
What does Reactive Abnormal mean on an HSV-2 test?

"Reactive Abnormal" (sometimes displayed as ">Reactive< Abnormal" or "HSV-2 Reactive — Abnormal") means the same thing as a Reactive result. The word "Abnormal" is the lab system's automated flag indicating the result is outside the reference interval — which for HSV-2 IgG is "Non Reactive." So "Abnormal" simply means the result is not the expected negative; it does not indicate how severe the infection is or that anything unusually serious has occurred. The clinically meaningful word is "Reactive."
What does equivocal mean on a herpes test?

Equivocal means the result fell in the borderline zone — the index value was too high to be clearly negative but not high enough to be confidently called positive. For most HSV-2 IgG assays, equivocal is defined as an index value between 0.90 and 1.09. An equivocal result cannot be interpreted as positive or negative. In most people with no known exposure and no symptoms, an equivocal result resolves to Non Reactive on repeat testing several weeks later. If equivocal results persist, the HSV-2 Western Blot or Inhibition assay (the supplemental test) can provide a definitive answer.
Is a Reactive HSV-2 IgG result always accurate?

No — particularly at low index values. Low-positive results (index values between 1.1 and 3.5) have substantially lower specificity, and false positives are well documented in this range. The CDC and IDSA guidelines recommend confirmatory testing with the HSV-2 Western Blot or Inhibition assay before making clinical decisions based on a low-positive IgG result. Results with an index value above 3.5 are more reliable but still not 100% accurate.
What does the HSV-2 IgG supplemental test or inhibition assay mean?

The supplemental test (also called the Inhibition assay, Biokit HSV-2, or HSV-2 Confirm) is a follow-up test used to determine whether a low-positive or equivocal HSV-2 IgG result is a true positive or a false positive. When your lab report says "HSV-2 IgG, Type Spec — Reactive" followed by "W/Refl HSV-2 Inhibition" or "HSV-2 IgG Inhibition IA," this means the lab automatically ran the supplemental test because your initial result fell in a range that requires confirmation. If the inhibition assay is also positive, the result is more likely a true positive. If the inhibition assay is negative, the initial reactive result may be a false positive — and HSV-2 Western Blot testing may be recommended for definitive confirmation.
What is the difference between HSV-1 and HSV-2 IgG tests?

HSV-1 and HSV-2 are both herpes simplex viruses but typically affect different areas of the body. HSV-1 most commonly causes oral herpes (cold sores); HSV-2 most commonly causes genital herpes — though either type can occur at either location. The IgG blood test can detect antibodies to each type separately using type-specific assays (based on the gG-1 and gG-2 glycoproteins). A positive HSV-1 IgG with a Non Reactive HSV-2 IgG means you have been exposed to oral herpes but not genital herpes type 2. A positive HSV-2 IgG regardless of HSV-1 status means exposure to the type that most commonly causes genital herpes.
Can I have HSV-2 and test Non Reactive?

Yes — in two specific situations. First, if you were tested within 12–16 weeks of initial infection, your immune system may not yet have produced detectable IgG antibodies (the window period). Second, extremely rarely, some individuals with HSV-2 infection may not mount a detectable antibody response, though this is uncommon. If you have symptoms consistent with herpes but a Non Reactive blood test, a swab or PCR test of an active lesion is more sensitive for diagnosing current infection than a blood antibody test.
What does a high HSV-2 IgG level mean?

The absolute number of your HSV-2 IgG index value does not indicate how severe the infection is, how long you have been infected, or how contagious you are. Once the result crosses into the Reactive range (index above 1.10 or 3.5 depending on the assay), a higher number does not convey additional clinical meaning in most contexts. IgG levels fluctuate over time and do not correlate with outbreak frequency, viral shedding, or transmission risk in any clinically validated way.
What does "HSV 2 IgG, Type Spec — Non Reactive" mean on HealthMatters?

This is the format HealthMatters displays for a negative HSV-2 IgG result. "HSV 2 IgG, Type Spec" is the test name — the type-specific herpes simplex virus 2 immunoglobulin G antibody test. "Non Reactive" is the result — meaning no HSV-2 antibodies were detected. This is the expected, normal result for someone who has not been exposed to HSV-2.
Can HSV-2 IgG antibodies become negative over time?

In the vast majority of cases, no. Once established, HSV-2 IgG antibodies persist for life and do not become negative. This is why the test is useful as a marker of prior exposure — a Reactive result from years ago typically remains Reactive indefinitely. However, there are a few situations where apparent changes can occur: if a previous result was a false positive (particularly a low-positive index value of 1.1–3.49), a repeat test or confirmatory test may come back negative — not because the antibodies disappeared, but because the first result was not a true positive. Very rarely, people with immunosuppression may have fluctuating antibody levels. If your HSV-2 IgG result has changed from Reactive to Non Reactive or equivocal, the most likely explanation is that one of the results was a borderline or false positive, particularly if the original index value was in the low-positive range.
Should I tell my partner if my HSV-2 IgG is positive?

Partner disclosure is a personal decision that depends on the reliability of your result and your relationship context, but it is generally recommended. If your HSV-2 IgG result is clearly positive (index value above 3.5, or confirmed by supplemental testing), disclosing to sexual partners allows them to make informed decisions about their own testing and protection. Most sexual health clinicians recommend disclosure. If your result is a low-positive (index 1.1–3.49) that has not yet been confirmed, completing confirmatory testing first is reasonable before making disclosure decisions — though this should not be used as a reason to delay indefinitely. Importantly, many people with HSV-2 transmit the virus without symptoms (through asymptomatic shedding), which is why disclosure and discussion of risk-reduction strategies (antiviral suppressive therapy, condom use) are clinically meaningful even in the absence of recognized outbreaks.
Can HSV-2 affect pregnancy?

Yes — HSV-2 is an important consideration during pregnancy, though most HSV-2-seropositive pregnancies proceed without complications when properly managed. The primary concern is neonatal herpes — a serious condition that can occur if the virus is transmitted to the baby during delivery, most commonly when a mother has a primary (first) genital herpes infection late in pregnancy. The risk is highest with a new infection acquired during the third trimester. For people with established HSV-2 infection (meaning a pre-existing positive IgG result), the risk of neonatal transmission during delivery is substantially lower because maternal antibodies provide some protection to the baby. Antiviral suppressive therapy (typically acyclovir or valacyclovir) from 36 weeks of pregnancy can further reduce the risk of outbreak at delivery. A positive HSV-2 IgG in pregnancy should be discussed with your OB/midwife — it does not automatically require a cesarean delivery or mean your baby is at high risk.

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HSV-2 IgG Blood Test: What Reactive, Non Reactive, and Equivocal Results Mean

QUICK ANSWER

WHAT IS "REACTIVE" AND "NON REACTIVE"? — READING YOUR RESULT

YOUR HSV-2 IgG INDEX VALUE — WHAT DOES YOUR NUMBER MEAN?

WHAT DOES REACTIVE MEAN? — HSV-2 IgG REACTIVE EXPLAINED

WHAT DOES NON REACTIVE MEAN? — HSV-2 IgG NON REACTIVE EXPLAINED

WHAT DOES EQUIVOCAL MEAN ON AN HSV-2 TEST?

THE SUPPLEMENTAL TEST — HSV-2 IgG INHIBITION ASSAY / WESTERN BLOT

IgG VS IgM — WHICH TEST IS WHICH?

TEST ACCURACY AND LIMITATIONS

WHAT DOES MY EXACT HSV-2 IgG INDEX VALUE MEAN?

SEROCONVERSION TIMELINE — WHEN DOES THE TEST BECOME RELIABLE?

HSV-1 + HSV-2 IgG COMBINED INTERPRETATION

SYMPTOMS THAT MAY BE CONSISTENT WITH HSV-2

MOST COMMON CLINICAL SCENARIOS

MOST COMMON HSV-2 IgG RESULTS

WHEN SHOULD I RETEST?

FAQ about Herpes Simplex 2 Ab, IgG

What does HSV 2 IgG, Type Specific Ab — Reactive mean?

What does HSV 2 Non Reactive mean?

What does Reactive Abnormal mean on an HSV-2 test?

What does equivocal mean on a herpes test?

Is a Reactive HSV-2 IgG result always accurate?

What does the HSV-2 IgG supplemental test or inhibition assay mean?

What is the difference between HSV-1 and HSV-2 IgG tests?

Can I have HSV-2 and test Non Reactive?

What does a high HSV-2 IgG level mean?

What does "HSV 2 IgG, Type Spec — Non Reactive" mean on HealthMatters?

Can HSV-2 IgG antibodies become negative over time?

Should I tell my partner if my HSV-2 IgG is positive?

Can HSV-2 affect pregnancy?

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