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A white blood cell differential counts the different types of white blood cells in a blood sample. There are five major kinds of white blood cells. The numbers of each type of white blood cell give important information about your immune system.
The test helps to measure how the body is responding to different types of infections. It can also help measure certain allergic reactions. It can sometimes be helpful in finding the stage of leukemia or how the body is responding to chemotherapy.
In general, you don't need to prepare before having this test. Your doctor may give you some specific instructions.
A health professional takes a sample of your blood.
This test will take a few minutes.
Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments, and call your doctor or nurse advice line (811 in most provinces and territories) if you are having problems. It's also a good idea to keep a list of the medicines you take. Ask your doctor when you can expect to have your test results.
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Current as of: September 8, 2022
Author: Healthwise Staff
Medical Review:Kathleen Romito MD - Family Medicine & Adam Husney MD - Family Medicine & Martin J. Gabica MD - Family Medicine
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