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80378M
HOMOCYSTEINE, TOTAL, RANDOM URINE

Test Code 80378M 
Test HOMOCYSTEINE, TOTAL, RANDOM URINE 
Methodology Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS) Stable Isotope Dilution Analysis 
Description Useful for diagnosing inborn errors of methionine metabolism including CS deficiency, MTHFR deficiency, thermolabile variant of MTHRF, and MS deficiency 
Specimen 4.0 mL (minimum 2.25 mL) from a random urine collection as follows:
1. Void and discard the first-morning urine specimen following an overnight fast.
2. Continue fasting and collect the next random urine specimen.
3. Send specimen FROZEN in a plastic, 13-mL urine tube. 
Reference Values Adults: 0 - 9 mcmol/g creatinine 
Analytic Time 2 Days 
Day(s) Test Set Up Monday through Friday 
CPT Code(s) 83090