Immunoglobulin A (IgA), Qn, Serum High or Low: Results & Normal Range
Other names: Total IgA (mg/dL), ImmunogA, IgA, Total, Quant
Optimal Result:
87 - 352 mg/dL,
or
0.87 - 3.52 g/L.
Immunoglobulin A, Qn, Serum measures the total concentration of IgA antibody in your blood. "Qn" means quantitative — a numerical value rather than a positive/negative result. IgA is the second most abundant antibody in serum and the primary antibody protecting mucosal surfaces in the gut, lungs, and airways.
This test is not the same as celiac-specific IgA tests (such as tissue transglutaminase IgA or deamidated gliadin IgA). Those tests detect specific antibodies. This test measures total IgA concentration — an entirely different measurement.
Immunoglobulin A, Qn, Serum — quick answer
- What it measures: Total IgA antibody concentration in serum
- Normal range: 70–400 mg/dL in adults (varies by age and lab)
- Units: mg/dL (milligrams per deciliter) or g/L
- High result: Associated with chronic infection, liver disease, autoimmune conditions, IgA nephropathy, alcohol use disorder, or rarely IgA plasma cell disorders
- Low result: Most commonly selective IgA deficiency — the most common primary immunodeficiency
- Also called: IgA Qn Serum, IgA Total, Total IgA, Immunoglobulin A Quantitative, IgA (RDL), IgA Ser Qn, iga total.lc
- Cancer risk: Mildly elevated IgA does not usually indicate cancer — very high levels (typically >1,000 mg/dL) with other abnormal findings may require further testing
- WarningHigh: A portal flag indicating the result exceeded the reference range — not an emergency; requires clinical interpretation
"WarningHigh Immunoglobulin A, Qn, Serum" is a lab portal flag indicating the result exceeded the laboratory's reference range. It is not a medical emergency — it means the result should be interpreted in clinical context by your doctor.
Immunoglobulin A normal range by age
IgA levels rise from birth through adolescence and stabilize in adulthood.
| Age group | Normal range (mg/dL) |
|---|---|
| 0–3 months | 1–53 |
| 4–6 months | 4–73 |
| 7–12 months | 11–106 |
| 1–3 years | 14–106 |
| 4–6 years | 22–159 |
| 7–9 years | 25–165 |
| 10–11 years | 34–274 |
| 12–13 years | 22–219 |
| 14–15 years | 36–330 |
| 16–17 years | 46–317 |
| Adults (≥18) | 70–400 mg/dL |
Reference ranges vary by laboratory and assay method. Always use your lab's printed reference range.
Unit conversion: To convert mg/dL to g/L, divide by 100. For example, 200 mg/dL = 2.0 g/L.
What does high Immunoglobulin A, Qn, Serum mean?
A high IgA result means total IgA is above the laboratory reference range. Elevated IgA is a nonspecific finding — many different conditions can raise it, and a mildly elevated result alone does not indicate a specific diagnosis.
Common causes of high Immunoglobulin A, Qn, Serum:
- Chronic infection — respiratory or gastrointestinal
- Liver disease — especially alcohol-related cirrhosis
- Autoimmune conditions — rheumatoid arthritis, SLE, celiac disease
- Kidney disease — IgA nephropathy (Berger's disease)
- Alcohol use disorder
- Plasma cell disorders — IgA multiple myeloma, MGUS (rare)
When to follow up urgently: IgA >1,000 mg/dL, or elevated result alongside anemia, kidney dysfunction, bone pain, or an abnormal protein band on electrophoresis.
Does high IgA mean cancer? A mildly or moderately elevated IgA does not indicate cancer. The vast majority of elevated IgA results have benign causes — infection, liver disease, autoimmune conditions, or alcohol use.
However, markedly elevated IgA — particularly when accompanied by a sharp single peak on protein electrophoresis (M-spike), bone pain, anemia, kidney dysfunction, or hypercalcemia — may indicate a plasma cell disorder requiring further investigation:
- IgA multiple myeloma — accounts for approximately 20–25% of multiple myeloma cases; associated with very high monoclonal IgA
- Monoclonal gammopathy of undetermined significance (MGUS) — a precursor condition; often discovered incidentally
- IgA-type Waldenström macroglobulinemia or lymphoma — rare
If your IgA is elevated and your doctor is concerned about a plasma cell disorder, they may order serum protein electrophoresis (SPEP), immunofixation, free light chains, or a bone marrow evaluation.
Specific value context:
| IgA result | Context |
|---|---|
| 400–600 mg/dL | Mildly above normal — most commonly benign; review clinical context |
| 600–1,000 mg/dL | Moderately elevated — warrants clinical evaluation |
| >1,000 mg/dL | Significantly elevated — consider SPEP and immunofixation to rule out monoclonal gammopathy |
What does low Immunoglobulin A, Qn, Serum mean?
A low IgA result means total IgA is below the laboratory reference range. The most important cause to consider is selective IgA deficiency.
Selective IgA deficiency is the most common primary immunodeficiency, affecting approximately 1 in 300–500 people. It is defined as a serum IgA below 7 mg/dL with normal IgG and IgM. Many people with selective IgA deficiency are entirely asymptomatic and never know they have it.
Clinical implications of low IgA:
- Recurrent infections — particularly sinopulmonary and gastrointestinal
- Increased susceptibility to certain autoimmune conditions (celiac disease, SLE, rheumatoid arthritis)
- False-negative celiac screening tests — tTG IgA and DGP IgA tests require normal total IgA to be valid; if total IgA is very low, celiac testing requires IgG-based tests instead
- Risk of severe transfusion reactions in IgA-deficient individuals who have developed anti-IgA antibodies
Other causes of low IgA:
- Medications — some anticonvulsants, immunosuppressants, antimalarials
- Protein-losing conditions — nephrotic syndrome, protein-losing enteropathy
- Bone marrow disorders
- Acquired immunodeficiency conditions
Important note for celiac testing: The lab comment "Total serum IgA is elevated — consider mucosal inflammatory conditions or underlying gammopathy" appears on some celiac reflex panels when total IgA is outside the expected range. This is a reflexive lab comment, not a diagnosis.
FAQ about Immunoglobulin A, Qn, Serum
-
What is Immunoglobulin A, Qn, Serum?
It measures the total concentration of IgA antibody in your blood. "Qn" means quantitative — a numerical result in mg/dL rather than a positive/negative answer. IgA is the primary antibody protecting mucosal surfaces in the gut, lungs, and airways. -
What does "QN" mean on a blood test?
QN stands for quantitative — meaning the test reports a measured number rather than simply detecting presence or absence. Immunoglobulin A, Qn, Serum reports your total IgA level in mg/dL. -
What is the normal range for Immunoglobulin A, Qn, Serum?
For adults, the standard reference range is 70–400 mg/dL. The HealthMatters optimal range is 87–352 mg/dL. Values vary by age — children have lower ranges than adults. Always refer to your specific lab's reference range on your report. -
What does high Immunoglobulin A, Qn, Serum mean?
High IgA is most commonly caused by chronic infection, liver disease, IgA nephropathy, alcohol use disorder, or autoimmune conditions. Levels up to 600 mg/dL are often benign and context-dependent. Levels above 1,000 mg/dL, or any elevation with anemia, bone pain, kidney dysfunction, or an abnormal protein band, warrant evaluation for plasma cell disorders. A mildly elevated result alone does not indicate cancer. -
Does high IgA mean cancer?
Not usually. The vast majority of elevated IgA results are caused by infection, liver disease, or autoimmune conditions — not cancer. Markedly elevated IgA (typically >1,000 mg/dL) with other abnormal findings such as an M-spike on protein electrophoresis, bone pain, or anemia may prompt evaluation for plasma cell disorders. A mildly or moderately elevated result alone does not indicate cancer. -
What does "WarningHigh Immunoglobulin A, Qn, Serum" mean?
This is a patient portal display flag indicating the result exceeded the laboratory's reference range. It is not a medical emergency — it simply means the result is above the upper limit and requires clinical interpretation by your doctor. -
What does low Immunoglobulin A, Qn, Serum mean?
Low IgA most commonly reflects selective IgA deficiency — the most common primary immunodeficiency. Many people with this condition are asymptomatic. A very low total IgA also invalidates IgA-based celiac tests (tTG-IgA, DGP-IgA) — IgG-based alternatives must be used instead. -
Is Immunoglobulin A, Qn, Serum the same as celiac testing?
No. This test measures total IgA concentration — how much IgA antibody is in your blood overall. Celiac-specific tests (tissue transglutaminase IgA, deamidated gliadin IgA) measure antibodies directed against specific celiac-related antigens. They are completely different tests that happen to both involve IgA. -
What does it mean if the lab report says "Total serum IgA is elevated — consider mucosal inflammatory conditions or underlying gammopathy"?
This is a reflexive interpretive comment added by some labs when total IgA exceeds the reference range on a celiac panel. It is not a diagnosis. It is prompting your doctor to consider whether the elevated IgA reflects mucosal inflammation (such as IBD or chronic infection) or a gammopathy — an overproduction of one immunoglobulin type. Your doctor will interpret this comment alongside your clinical picture. -
Can IgA levels fluctuate?
Yes. IgA levels can vary with infections, inflammatory flares, alcohol intake, and other transient factors. A single out-of-range result should typically be confirmed with repeat testing before significant workup is initiated.
Lab Results Explained and Tracked
What does it mean if your Immunoglobulin A, Qn, Serum result is too high?
A high Immunoglobulin A, Qn, Serum result means total IgA is above the laboratory reference range. Elevated IgA is a nonspecific finding — the most common causes are chronic infection, liver disease, IgA nephropathy, alcohol use disorder, and autoimmune conditions. A mildly elevated result does not indicate cancer.
Markedly elevated IgA — particularly above 1,000 mg/dL, or with an M-spike on protein electrophoresis — warrants further investigation for plasma cell disorders including IgA multiple myeloma. Discuss your result with your doctor, who will interpret it alongside symptoms, other labs, and your clinical history.
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What does it mean if your Immunoglobulin A, Qn, Serum result is too low?
A low Immunoglobulin A, Qn, Serum result means total IgA is below the laboratory reference range. The most common cause is selective IgA deficiency — the most common primary immunodeficiency, affecting approximately 1 in 300–500 people. Many individuals with this condition are asymptomatic.
Clinically, low IgA can increase susceptibility to certain infections and autoimmune conditions. Importantly, if you are being tested for celiac disease, a very low total IgA invalidates tTG-IgA and DGP-IgA tests — IgG-based alternatives should be used instead. Discuss your result with your doctor.
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