Glucose-6-phosphate dehydrogenase test
Definition
Glucose-6-phosphate dehydrogenase (G6PD) is a protein that helps red blood cells work properly. The G6PD test looks at the amount (activity) of this substance in red blood cells.
Alternative Names
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 health care provider may recommend this test if you have signs of G6PD deficiency. This means you do not have enough G6PD activity.
Too little G6PD activity leads to the destruction of red blood cells. This process is called hemolysis. When this process is actively occurring, it is called a hemolytic episode.
Hemolytic episodes can be triggered by infections, certain foods (such as fava beans), and certain medicines, including:
- Drugs used to reduce fever
- Nitrofurantoin
- Phenacetin
- Primaquine
- Sulfonamides
- Thiazide diuretics
- Tolbutamide
- Quinidine
Normal Results
Normal values vary and depend upon the laboratory used. Some labs use different measurements or test different samples. Talk to your provider about the meaning of your specific test results.
What Abnormal Results Mean
Abnormal results mean you have a G6PD deficiency. This can cause hemolytic anemia in certain conditions.
Risks
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. 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 lightheaded
- Multiple punctures to locate veins
- Hematoma (blood buildup under the skin)
- Infection (a slight risk any time the skin is broken)
References
Chernecky CC, Berger BJ. Glucose-6-phosphate dehydrogenase (G6PD, G-6-PD), quantitative - blood. In: Chernecky CC, Berger BJ, eds. Laboratory Tests and Diagnostic Procedures. 6th ed. St Louis, MO: Elsevier Saunders; 2013:594-595.
Gallagher PG. Hemolytic anemias: red blood cell membrane and metabolic defects. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap152.
Kaplan M, Wong RJ, Burgis JC, Sibley BE, Stevenson DK. Neonatal jaundice and liver diseases. In: Martin RJ, Fanaroff AA, Walsh MC, eds. Fanaroff and Martin's Neonatal-Perinatal Medicine. 11th ed. Philadelphia, PA: Elsevier; 2020:chap 91.