G6PD screen should not be performed on post transfusion specimen. Please collect sufficient for a FBC and reticulocyte count as these should be performed with both the G6PD Screening test and the G6PD assay.
RETICULOCYTOSIS causes false-normal results because young red cells have more G6PD activity. If the test is carried out during an acute haemolytic episode the patient's blood should be retested when the reticulocyte count has returned to normal. FALSE-DEFICIENT results may be due to severe anaemia and red cell aplasia. If in doubt, it is best to proceed to a quantitative enzyme assay - please see General Notes under G6PD assay