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Denver Genetic Laboratories

Branch-Chain Amino Acids, Quantitative, Serum or Plasma

Clinical Test Information - CHCO Biochemical Genetics Laboratory


CPT Code:


Test Includes:

Valine, leucine, isoleucine, and alloisoleucine.


Monday - Friday, 0800 - 1700.

Turnaround Time:

2 - 3 days.

Minimum Volume:

0.3 mL (at least 0.5 mL preferred).

Specimen Handling:

Centrifuge and separate from cells within 1 hour of drawing.  Freeze serum
or plasma.

Interpretive Reference Range:

Provided with patient report.  Age dependent.


Useful in diagnosis & monitoring of maple syrup urine disease (MSUD).


Ion exchange chromatography (amino acid analyzer).