Absolute Lymphocyte Count (from Whole Blood)

Why This Test Might Be Ordered

Your doctor may order this test to check for infections, monitor immune function, evaluate conditions like leukemia, or assess responses to treatments such as chemotherapy or immune-modulating therapies. It can also help diagnose autoimmune diseases or identify risks of infections in people with weakened immune systems, such as those with HIV or undergoing certain medications.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into a vein (usually in your arm), and blood will be drawn into a test tube. The process takes about 5 minutes, and you may feel a brief pinch or discomfort. If you’re nervous, let your healthcare provider know—you can use numbing cream or take an over-the-counter pain reliever beforehand.

What the Results Mean

Results are typically reported as a count of lymphocytes per microliter (µL) of blood. A lower-than-normal count may suggest immune suppression, infection, or certain cancers, while a higher-than-normal count could indicate chronic inflammation, certain infections, or conditions like lymphoma.

Common Conditions Monitored

This test is often used to monitor conditions like chronic lymphocytic leukemia, HIV/AIDS, autoimmune diseases (e.g., lupus or rheumatoid arthritis), and after treatments that weaken the immune system (e.g., chemotherapy or organ transplants). It can also help track how well your body is responding to treatments.