Overview: G6PD Mutation TestIntroduction: The G6PD Mutation Test detects G6PD gene mutations to diagnose enzyme deficiency, causing anemia or jaundice. Aligned with 2023 ASH guidelines, it uses PCR for high specificity, aiding in genetic screening. This test is critical for guiding diagnosis, management, and improving outcomes in molecular pathology for patients with suspected G6PD deficiency.
Other Names: G6PD Genetic Assay, Glucose-6-Phosphate Dehydrogenase Mutation Test.
FDA Status: Laboratory-developed test (LDT), meeting molecular pathology standards for diagnostic accuracy.
Historical Milestone: G6PD mutation testing began in the 1990s with genetic research. PCR-based assays emerged in the 2000s, improving accuracy for mutation detection.
Purpose: Diagnoses G6PD deficiency, guides management, and monitors G6PD mutations in patients with anemia or jaundice.
Test Parameters: 1. G6PD Gene Mutation
Pretest Condition: No fasting required. Collect whole blood, buccal swab, or saliva at any time. Report symptoms like anemia or jaundice, and list triggers or medications.
Specimen: 2-5 mL whole blood (EDTA), 1-2 buccal swabs (sterile swab), or 1-2 mL saliva (sterile container). Transport in a biohazard bag within 24 hours.
Sample Stability at Room Temperature: 24 hours
Sample Stability at Refrigeration: 48 hours
Sample Stability at Frozen: Not frozen
Medical History: Document anemia, jaundice, or history of G6PD deficiency. Include triggers (e.g., fava beans, drugs) and current medications.
Consent: Written consent required, detailing the tests purpose, diagnostic implications, and potential need for genetic counseling.
Procedural Considerations: Uses PCR to detect G6PD gene mutations. Results are available in 3-5 days, supporting clinical decisions.
Factors Affecting Result Accuracy: Low DNA yield or contamination can affect results. Rare mutations may require additional testing.
Clinical Significance: Positive G6PD mutations confirm deficiency, prompting trigger avoidance. Negative results may require functional testing.
Specialist Consultation: Consult a hematologist or geneticist for result interpretation.
Additional Supporting Tests: G6PD quantitative test, CBC, or reticulocyte count to confirm deficiency.
Test Limitations: False negatives may occur with rare mutations. Results require clinical correlation.
References: ASH G6PD Guidelines, 2023; Blood, Cappellini MD, 2022.
