Glucose 6 Phosphate Dehydrogenase (G6PD Qualitative) What is G6PD Qual.? The Glucose 6 Phosphate Dehydrogenase test or G6PD Qualitative test is performed to determine the presence of an inherited deficiency of the enzyme Glucose 6 Phosphate Dehydrogenase. Why is G6PD Qual. done? The test is performed when recurring symptoms of haemolytic anemia occur, or jaundice develops and persists in newborns. The test is usually performed when all other causes of anemia or jaundice have been checked out to be negative. It is also performed in case of newborns as a screening test within the first few days after birth. Interpreting G6PD Qual. resultsThe qualitative test checks for fluorescence under UV light. If no fluorescence is detected, the test is declared positive.