Blood differential test

A blood sample is needed. A laboratory specialist takes a drop of blood from your sample and smears it onto a glass slide. The smear is stained with a special dye, which helps tell the difference between various types of white blood cells. Five types of white blood cells, also called leukocytes, normally appear in the…

No special preparation is necessary.

When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or slight bruising. This soon goes away.

This test is done to diagnose an infection, anemia , or leukemia . It may also be used to monitor one of these conditions or to see if treatment is working.

The different types of white blood cells are given as a percentage of all white cells: Neutrophils: 40% to 60% Lymphocytes: 20% to 40% Monocytes: 2% to 8% Eosinophils: 1% to 4% Basophils: 0.5% to 1% Band (young neutrophil): 0% to 3%

Any infection or acute stress increases your number of white blood cells. High white blood cell counts may be due to inflammation, an immune response, or blood diseases such as leukemia. Abnormal or immature white blood cells may indicate leukemia or bone marrow invasion by cancer or infection. It is important to…

There is little risk involved with having your blood taken. Veins and arteries vary in size from one person to another, and from one side of the body to the other. Taking blood from some people may be more difficult than from others. Other risks associated with having blood drawn are slight, but may include: Excessive…

Bain BJ. The peripheral blood smear. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine . 26th ed. Philadelphia, PA: Elsevier; 2020:chap 148. Nasr MR, Hutchison RE. Leukocytic disorders. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods . 24th ed. Philadelphia, PA:…