Overview: NGS Organic Aciduria Sequencing TestIntroduction: The NGS Organic Aciduria Sequencing Test sequences genes to diagnose organic aciduria, causing metabolic issues or developmental delays. Following 2023 NORD guidelines, it uses PCR for high specificity, supporting metabolic screening. This test is critical for guiding diagnosis, treatment planning, and improving outcomes in molecular pathology for patients with suspected organic acidurias, such as methylmalonic or propionic aciduria.
Other Names: Organic Aciduria NGS Assay, Organic Aciduria Gene Panel.
FDA Status: Laboratory-developed test (LDT), meeting molecular pathology standards for diagnostic accuracy.
Historical Milestone: Organic aciduria sequencing began in the 1990s with metabolic disorder research. NGS methods improved in the 2010s, enhancing diagnostic precision.
Purpose: Sequences genes to diagnose organic aciduria, guides treatment, and evaluates patients with metabolic issues or developmental delays.
Test Parameters: 1. Organic Aciduria Genes
Pretest Condition: No fasting required. Collect whole blood, buccal swab, or saliva. Report history of metabolic acidosis, developmental delays, or organic aciduria symptoms.
Specimen: Whole Blood (EDTA, 2-5 mL), Buccal Swab (sterile swab, 1-2 swabs), Saliva (sterile container, 1-2 mL). Transport in a biohazard container.
Sample Stability at Room Temperature: 24 hours
Sample Stability at Refrigeration: 48 hours
Sample Stability at Frozen: Not frozen
Medical History: Document metabolic acidosis, developmental delays, vomiting, or family history of organic aciduria. Include current medications, especially metabolic therapies.
Consent: Written consent required, detailing the tests purpose, organic aciduria implications, and risks of sample collection.
Procedural Considerations: Uses next-generation sequencing to analyze organic aciduria genes (e.g., MMUT, PCCA). Results are available in 3-5 days, supporting clinical decisions. Performed in laboratories, often for organic aciduria diagnosis.
Factors Affecting Result Accuracy: Low DNA yield or improper sample storage can affect results. Contamination may reduce specificity.
Clinical Significance: Identified mutations confirm organic aciduria, guiding dietary management or vitamin therapy. Negative results may require urine organic acid testing.
Specialist Consultation: Consult a metabolic specialist or geneticist for result interpretation and treatment planning.
Additional Supporting Tests: Urine organic acids, plasma acylcarnitines, or ammonia levels to confirm organic aciduria diagnosis.
Test Limitations: Not all organic aciduria cases are genetic; clinical correlation is needed. Sample quality affects sensitivity.
References: NORD Organic Aciduria Guidelines, 2023; Journal of Inherited Metabolic Disease, Baumgartner MR, 2022.
