Monday - Friday, 0800 - 1700.
2 - 3 days.
Random urine, morning specimen preferred. Refrigerate or freeze without preservative. No patient preparation necessary.
Interpretive Reference Range:
Normal < 20.2 mg/mg creatinine (per Mayo Medical Laboratory).
Diagnostic follow-up of increased C4 carnitine ester on newborn screen to confirm diagnosis of ethylmalonic encephalopathy.
Stable isotope dilution gas chromatography-mass spectrometry (GC/MS).