Eosinophil count in serum/plasma (absolute)

What Is an Eosinophil?

Eosinophils are a type of white blood cell that play a role in defending the body against parasites, allergens, and certain infections. They also contribute to inflammatory responses. When your body detects an allergic reaction, infection, or other immune challenges, eosinophils increase in number to help manage the situation.

Why Might This Test Be Ordered?

Your healthcare provider may order this test if you have symptoms like persistent itching, skin rashes, asthma, or unexplained fatigue. It can also be used to check for conditions such as eosinophilic esophagitis, parasitic infections, or certain types of cancer.

When Might You Need Follow-Up?

If your eosinophil levels are high, your doctor may recommend further testing to identify the underlying cause, such as allergies, infections, or autoimmune conditions. If levels are low, it could indicate immune suppression or other health concerns that need evaluation.

What Does the Test Involve?

The test involves drawing blood from a vein in your arm. A small amount of blood is collected and sent to a lab for analysis. The lab will count the number of eosinophils in your serum or plasma sample using a specialized blood test.