Glucose-6-phosphate dehydrogenase (G6PD) is a type of protein, called an
RBC G6PD test; G6PD screen
How the Test is Performed
A blood sample is needed.
How to Prepare for the Test
No special preparation is usually necessary.
How the Test will Feel
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 a slight bruise. This soon goes away.
Why the Test is Performed
Your doctor may order this test if you have signs of
Too little G6PD activity leads to the destruction of red blood cells. This process is called
Hemolytic episodes can be triggered by infections, severe stress, certain foods (such as fava beans), and certain medicines, including:
- Antipyretics (drugs used to reduce fever)
- Thiazide diuretics
Normal values vary and depend upon the laboratory used. Some labs use different measurements or test different samples. Talk to your doctor about the meaning of your specific test results.
What Abnormal Results Mean
Abnormal results mean you have a G6PD deficiency, which can cause
Veins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.
Other risks associated with having blood drawn are slight, but may include:
- Excessive bleeding
- Fainting or feeling light-headed
- Hematoma (blood accumulating under the skin)
- Infection (a slight risk any time the skin is broken)