At a Glance
Your absolute lymphocyte count is how many lymphocytes are in a microliter of blood. On this report it does something specific: it is the population the panel's percentages are shares of.
Quest test 36420, Lymphocyte Subset Panel 2, reports ten lines: % CD3 (Mature T Cells), Absolute CD3+ Cells, % CD4, Absolute CD4+ Cells, % CD8, Absolute CD8+ Cells, CD4/CD8 Ratio, % CD19 (B Cells), Absolute CD19+ Cells, and Absolute Lymphocytes.
Four of those lines are percentages, and each is a percentage of the lymphocytes. As Testing.com puts it for the CD4 line, "the CD4 percentage is that percentage of total lymphocytes that are identified as CD4 cells." So this count is the total those four percentages are taken from.
That is worth knowing before reading it as a finding in its own right. A percentage can hold steady while the total moves, or the reverse, and the panel is usually read as a set rather than a line at a time.
What this page does not claim is how the panel produces its absolute CD3, CD4, CD8 and CD19 counts. Quest gives the methodology as flow cytometry and does not say more, so whether those counts are measured directly or worked out from this one is not something to assume.
This is not the lymphocyte line from a blood count
The same quantity can appear on a complete blood count. This is a separate assay, on a separate specimen.
Quest gives the panel's methodology as flow cytometry, and its collection instruction is explicit: "If a CBC is also required, a separate EDTA (lavender-top) tube must be submitted." So the two results come from different runs on different tubes.
What Quest does not state is how this particular Absolute Lymphocytes line is produced within the panel, and this page does not guess. For the blood-count version StatPearls describes the route — the absolute count "calculates as the total white blood cell count (WBC) multiplied by the percentage of lymphocytes in the peripheral blood" — but that is the CBC's method, and knowing it says nothing about this panel's.
What follows either way is that the two are not interchangeable, and that a number from one should not be read against an interval from the other.
If you are holding a routine blood count rather than a subset panel, the lymphocyte count there is a different page's subject — the site has a separate page for the blood-count lymphocyte result, and it is the better place to start.
What the panel is for
Quest states the purpose in one line: "T-lymphocyte count assists in evaluating cellular immunocompetency."
Testing.com describes where CD4 counts are used beyond HIV care — monitoring after organ transplant to judge how well immunosuppressive medication is working, investigating suspected primary immunodeficiency, and alongside certain cancers and infections.
The panel's composition tells you what was measured. It does not tell you why it was ordered in your case, and that is a question for the clinician who ordered it rather than something to infer from the lines on the report.
How to read your result
Read this against the interval printed on your own report.
| What your report shows | What that establishes | What it leaves open |
|---|---|---|
| A count inside the interval on your report | Your lymphocyte number sits within the range it was measured against | What the subset lines say — they are read alongside it |
| Above 4,000 lymphocytes per microliter | Lymphocytosis, on the definition StatPearls gives for adults | Why. It has many causes and the panel's subset lines are part of how that is sorted out |
| A count that has fallen since a previous panel | A change in the total the percentages are taken from | Whether the subsets fell with it or only the total did — those are different findings |
| Any count, with the CD4 line below 500 cells/µL | The CD4 number sits below the range Testing.com gives for healthy adults without HIV | What it means in your situation. A CD4 count is interpreted in a clinical context, not from a table |
| Any count, with the CD4 line below 200 cells/µL | A low CD4 count, which has several possible causes | Whether the CDC's stage 3 criterion applies — it does so where HIV infection has been confirmed. Either way this belongs with the clinician promptly |
| A count near the edge of the interval, with normal subsets | Very little on its own | Whether the interval is even the right comparison. Reference intervals for this panel come from the performing laboratory |
No row here is a diagnosis, and none of them is read without the rest of the panel.
If you remember only one thing
On this panel the absolute lymphocyte count is the total the CD3, CD4, CD8 and CD19 percentages are shares of, so it is read together with them rather than on its own.
If you are reading it because one number looked wrong, read the subset lines alongside it — and take the panel as a whole to the clinician who ordered it.
Two people, same result
Two people have an absolute lymphocyte count of 1,900 cells per microliter.
For the first, the CD4 and CD8 lines sit where they did on the last panel. The total is steady and so is its composition, which is the ordinary reading.
For the second, the total is the same as last time but the CD4 line has dropped and the CD4/CD8 ratio with it. The lymphocyte count says nothing has changed; the panel says something has.
Same number, same panel. The count on its own could not separate them, which is precisely why the subset lines are there.
What this result cannot tell you
Which lymphocytes they are — fully. The total includes T cells, B cells and natural killer cells. This panel reports T-cell markers (CD3, CD4, CD8) and the B-cell marker CD19; it reports no dedicated natural-killer-cell line, so the subset results do not account for the whole lymphocyte population.
Whether your immune system is working. Quest describes the panel as assisting in evaluating cellular immunocompetency — assisting, as part of an assessment, not settling it.
Why the panel was ordered. The lines tell you what was measured.
How it compares with a count from a blood count. Different assay, different specimen, different interval.
Whether a change is meaningful. A single count has no trend in it, and on this panel the trend usually matters more than the value.
Common interpretation mistakes
Reading it in isolation. It is the total the percentages are taken from, so the two are read together.
Comparing it with a lymphocyte count from a CBC. Different assay on a different specimen — Quest requires a separate tube when both are run.
Reading a subset percentage as a count. A percentage of lymphocytes and a number of cells per microliter are different quantities, and the panel reports both for each subset.
Taking a published range as your range. Quest's current directory entry for this panel does not display a numeric interval — it reads "See Laboratory Report".
Assuming a normal total means normal subsets. The two people above have the same total.
Questions your doctor may ask
What was this panel ordered to look at?
Have you had a lymphocyte subset panel before, and do you know what the CD4 and CD8 lines were?
Are you taking any medicine that affects the immune system, including steroids or immunosuppressants?
Have you had a recent infection, and were you unwell around the time of the draw?
Should this be repeated, and if so when?
Read together with
CD4 and CD8 counts and percentages, and the CD4/CD8 ratio — the subset results, read alongside this total. The percentages are shares of the lymphocyte population; the ratio is CD4 divided by CD8 and does not involve this number at all.
Lymphocytes (Absolute) on a blood count — the same quantity on a different assay and a different specimen, against a different interval. The page for the blood-count result is where a CBC lymphocyte number belongs.
White blood cell count — the total this is part of on a blood count, and the figure the CBC route multiplies by the lymphocyte percentage.
Neutrophils and Monocytes — the other differential populations, for anyone holding a blood count alongside this panel.
Clinical pearls
Quest's current directory does not display a numeric reference interval for test 36420 — the entry reads "See Laboratory Report" — and its standing note is that ranges are "provided as general guidance only. To interpret test results use the reference range in the laboratory report."
The specimen is unforgiving. Quest asks for 5 mL of whole blood in an EDTA lavender-top tube, gives room-temperature stability as 72 hours, and lists refrigerated and frozen as unacceptable — flow cytometry needs intact, living cells. Hemolyzed, clotted, lithium heparin and ACD specimens are rejected.
This test code is for non-New York patient testing; Quest directs New York patient testing to test code 17329. The CPT codes carry a Medicare limited coverage policy and may require a signed ABN.
StatPearls defines lymphocytosis in adults as "an increase in absolute lymphocyte count (ALC) to more than 4000 lymphocytes/microL", and notes that "peripheral blood flow cytometry is essential to determine the proliferation of monoclonal cells" — which is the same technology this panel runs on, pointed at a different question.
Clinical Takeaway
Absolute Lymphocytes is one of ten lines on Quest test 36420, Lymphocyte Subset Panel 2, alongside % and absolute counts for CD3, CD4, CD8 and CD19 and the CD4/CD8 ratio. Quest gives the panel's purpose as "T-lymphocyte count assists in evaluating cellular immunocompetency" and its methodology as flow cytometry, on 5 mL of whole blood in an EDTA tube, with refrigerated and frozen specimens unacceptable and a separate tube required if a CBC is also ordered. On this panel the four subset percentages are shares of the lymphocyte population, as Testing.com states for CD4 — "the CD4 percentage is that percentage of total lymphocytes that are identified as CD4 cells" — so the absolute lymphocyte count is the total those percentages are taken from, and the total and the subset results are interpreted together. How the panel produces its absolute subset counts is not stated by Quest and is not claimed here. It is not interchangeable with the lymphocyte count on a complete blood count, where StatPearls describes the absolute count as calculated from the white cell count multiplied by the lymphocyte percentage. StatPearls defines adult lymphocytosis as more than 4000 lymphocytes/microL. Testing.com gives normal CD4 levels in healthy adults without HIV as 500–1500 cells/µL and states that a CD4 count below 200 cells/µL meets the CDC's definition of AIDS (stage III HIV) — a classification applying where HIV infection has been confirmed, since Testing.com also states that "the CD4 count doesn't detect HIV itself" and that HIV diagnosis requires separate antigen/antibody and confirmatory testing. It describes CD4 testing as also used in transplant monitoring, suspected primary immunodeficiency, and alongside certain cancers and infections. Quest's current directory does not display a numeric reference interval for the panel, directing readers to the laboratory report.
In one sentence
On a lymphocyte subset panel the absolute lymphocyte count is the total that the CD3, CD4, CD8 and CD19 percentages are shares of, so it and the subset results are read together.
Bottom line
Your absolute lymphocyte count is how many lymphocytes are in a microliter of blood. On this panel the CD3, CD4, CD8 and CD19 percentages are all shares of it, so it is the figure those lines are read against — and they are read together.
That also means the two are read together. A total near the edge of its interval and steady subsets are a different picture from the same total with subsets that have moved — and an abnormal total is a finding in its own right: StatPearls defines lymphocytosis in adults from the absolute count alone, at more than 4000 lymphocytes per microliter.
This is not the lymphocyte line from a routine blood count. The panel runs by flow cytometry on its own tube — Quest asks for a separate EDTA tube if a blood count is wanted too — and a number from one test should not be read against the interval from the other. If what you have in front of you is a blood count rather than a subset panel, that result has its own page on this site.
Two practical things. Quest's current directory does not display a numeric reference interval for this panel and points to the laboratory report instead, so the interval printed beside your own result is the one it was measured against. And the panel is read as a set: take it to the clinician who ordered it with any earlier panels, and ask what the CD4, CD8 and ratio lines show rather than reading this one number on its own.
Absolute Lymphocytes
Every lab result you’ve ever had, charted and explained.
Healthmatters is a tracker for your lab results. Upload a report from any lab, any country — every marker charted and explained.
Start with my report →
Frequently Asked Questions
What are absolute lymphocytes on a lymphocyte subset panel?
Is this the same as the lymphocyte count on my blood count?
What is a normal absolute lymphocyte count?
Why does the panel report both a percentage and an absolute count for CD4?
What does a high absolute lymphocyte count mean on this panel?
What is the panel used for?
Why did the laboratory need a separate tube?
My CD4 count is below 500. What does that mean?
All our content is backed by peer-reviewed studies, academic research, and trusted medical sources. We’re committed to accuracy and transparency — see our editorial policy for details.
-
Lymphocyte Subset Panel 2 — Test 36420
-
Lymphocytosis
-
CD4 Count Test: What It Measures and How It Works