PBC Health / immune markers / CBC · September 6, 2026
Absolute Lymphocyte Count: real immune marker, not a stand-alone “early death” test
PBC Health source-check on Dr. Patrick Soon-Shiong’s ALC clip: CBC-with-differential basics, mortality-association evidence, cost context and limits.
Verdict: useful marker, not a stand-alone death prediction. ALC is a real CBC-with-differential line item and low lymphocyte counts are associated with higher mortality in large observational cohorts. But one result does not diagnose why the count is low, and it does not prove an individual will die early.
What the test is
Absolute lymphocyte count is the number of lymphocytes — T cells, B cells and NK cells grouped together — in a microlitre of blood. It usually comes from a CBC with differential.
How to get it and cost
- Ask a clinician for a CBC with differential; many routine panels already include it.
- In Canada, medically necessary CBCs are usually provincially covered with a requisition. Private/self-pay prices vary; listings commonly put a CBC around low double-digits to roughly $60, while broader private panels cost more.
- Do not interpret it alone. Compare against the lab’s reference range and symptoms/history.
Numbers mentioned
| Number | Context |
|---|---|
| ~1,000/µL | Common adult lymphocytopenia threshold in references such as Merck Manual. |
| 1.1 × 10⁹/L | Copenhagen General Population Study lymphopenia cutoff; associated with adjusted HR 1.63 for all-cause mortality. |
| 1,500/µL | A broader “watch” threshold used in some clinical commentary, but not a universal diagnostic cutoff. |
What it does not mean
- It is not a cancer test by itself.
- It does not say what kind of lymphocyte is low; flow cytometry is needed for subtypes.
- Low ALC can be temporary after infection, stress, steroids, chemotherapy/radiation or other illness.
- Any drug claims, including IL-15/ANKTIVA claims, belong in oncology care — not self-treatment.