Absolute Lymphocyte Count (from Whole Blood)

Why This Test Might Be Ordered

Your healthcare provider may order this test to check for infections, monitor immune-related conditions (like certain cancers or autoimmune diseases), or evaluate symptoms such as frequent infections, fatigue, or unexplained weight loss. It can also be used to monitor treatment responses in conditions like leukemia or HIV.

What to Expect Before the Test

No special preparation is needed for this test. You’ll have a small needle inserted into your arm or hand to draw a blood sample. The process usually takes a few minutes, and you may feel a brief pinch. If you’re on blood thinners or have a history of bleeding issues, let your provider know.

What Happens During the Test

The blood sample is sent to a lab where it is analyzed to count the number of lymphocytes. This is typically done using automated blood cell counters, which separate and count different types of white blood cells.

What the Results Mean

Results are reported as a count of lymphocytes per microliter (µL) of blood. A lower than expected count may indicate immune suppression, infections, or certain medical conditions. A higher than expected count might suggest inflammation, certain infections, or other underlying health issues. Your provider will interpret results in the context of your overall health and symptoms.