Methylmalonic Acid

CPT Code(s):

83921

Methodology:

Liquid chromatography tandem mass spectrometry (LC-MS/MS)

Performed:

As needed

Use:

Evaluation of cobalamin (vitamin B12) deficiency

Specimen Requirements:

Collect 2 mL blood in a red-top serology tube. Centrifuge the blood and remove serum from cells within two hours of collection.

Interpretation Data:

Reference range, < 0.40 µM