Eosinophil Count (Manual Differential Blood Count)

Why Is This Test Done?

Your healthcare provider may order this test to investigate symptoms like persistent itching, skin rashes, asthma, or unexplained allergies. It may also be used to check for conditions like parasitic infections, certain cancers, or autoimmune disorders that affect eosinophil counts.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm or hand to draw blood. The process usually takes a few minutes, and you may feel a brief pinch. If you’re nervous, let your provider know so they can help.

What the Results Mean

Eosinophil counts are typically reported as a percentage of total white blood cells or an absolute count (number per microliter of blood). Higher-than-normal levels may suggest allergies, infections, or other conditions. Lower-than-normal levels might indicate immune suppression or other health concerns.

Common Conditions Linked to Eosinophil Levels

Elevated eosinophils can be linked to allergies, asthma, parasitic infections, certain cancers (like lymphoma), or autoimmune diseases. Low eosinophils may be seen in conditions affecting immune function or chronic illnesses.