The Glucose 6 Phosphate Dehydrogenase (G6PD Quantitative) test is a blood test that measures the amount of the G6PD enzyme in the blood. The G6PD enzyme plays a crucial role in protecting red blood cells from damage caused by certain medications, infections, and other stressors. A deficiency in this enzyme can lead to a condition called G6PD deficiency, which can cause hemolytic anemia, a condition in which the red blood cells are destroyed faster than the body can replace them. The G6PD quantitative test is used to diagnose G6PD deficiency and to monitor its severity. The test is particularly important for people of African, Mediterranean, and Southeast Asian descent, as they are more likely to have this enzyme deficiency. G6PD deficiency can be managed with dietary modifications, medication adjustments, and avoiding triggers that can cause anemia. By diagnosing and managing G6PD deficiency, doctors can help prevent serious health complications, such as jaundice, organ damage, and even death.