Methylmalonic Acid (LABCORP)

Test Code
99901000985


Alias/See Also
LAB835: Methylmalonic Acid, Serum | LABCORP EAP: 706961


CPT Codes
83921x1

Preferred Specimen
LABCORP LAB: Serum Separator Tube (Refrigerated) Min Vol: .6


Other Acceptable Specimens
LABCORP LAB: YELLOW TOP: (Refrigerated) Min Vol: .6
LABCORP LAB: LIME TOP- LIHEP: (Refrigerated) Min Vol: .6
LABCORP LAB: MICRO RED: (Refrigerated) Min Vol: .6
LABCORP LAB: MICRO YELLOW: (Refrigerated) Min Vol: .6
LABCORP LAB: RED TOP - PLAIN: (Refrigerated) Min Vol: .6


Instructions
Adults: 4 mL lavender-top (EDTA) tube *Pediatric minimum: 1 lavender top microtainer*


Transport Temperature
Specimen: Plasma (preferred); serum is acceptable. Volume: 2 mL Minimum Volume: 1 mL Container: Lavender-top (EDTA) tube, green-top (heparin) tube, red-top tube, or gel-barrier tube Collection: Separate plasma or serum from cells immediately to avoid a false elevation of homocysteine. After one hour at room temperature, a 10% increase may be seen. Transfer plasma and serum to a plastic transport tube (see Causes for Rejection). Homocysteine results increase by approximately 35% and 75% for samples not centrifuged and/or not separated from the clot for periods of four and 24 hours, respectively. Serum values are expected to be higher than plasma values. Slightly higher values are observed in nonfasting patients. Storage Instructions: Room temperature. Stable at room temperature or refrigerated for 14 days. Stable frozen for six months.


Report Available
LABCORP LAB
STAT: 5760 min
Routine: 5760 min
Extended TAT: No TAT min
Timed: 5760 min
Life or Death: 5760 min



Last Updated: March 6, 2023


The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.