What should you know about a G6PD blood test?

A clinician takes a blood sample and the laboratory measures G6PD activity. The test may be considered after jaundice, dark urine, unexplained anaemia, a reaction to a medicine, or a relevant family history. Results are not interpreted in isolation: recent red-cell breakdown, transfusion, illness, and the balance of young and mature red blood cells can affect the picture. A repeat test may be suggested when timing makes the result uncertain.

Follow the laboratory's instructions and list every medicine, supplement, and recent illness. Keep taking prescribed medicines unless the prescriber tells you otherwise. Once the result is reviewed, keep a clear record of any confirmed deficiency and show it before receiving new medicines. Your clinician may discuss trigger avoidance, family testing, or additional tests for anaemia.

Get urgent help for sudden severe weakness, breathlessness, fainting, chest pain, yellowing of the eyes, or dark urine, particularly after an infection or new medicine. Arrange a routine review if fatigue or pallor continues, because a G6PD test is only one part of investigating these symptoms.

Ask what prompted the test, whether its timing could affect the result, when to expect an explanation, and whether further blood tests are needed. Ask which medicines should be checked in the future and whether close relatives may benefit from assessment.