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Denver Genetic Laboratories

Benzoic Acid, Quantitative, Serum or Plasma

Clinical Test Information - CHCO Biochemical Genetics Laboratory


CPT Code:



Monday - Friday, 0800 - 1700.

Turnaround Time:

2 - 3 days.

Minimum Volume:

0.5 mL (at least 1.0 mL preferred).

Specimen Handling:

Centrifuge and separate from cells as soon as possible.  Freeze immediately.

Interpretive Reference Range:

      Concentration < 2.5 mM: Not toxic.
      Concentration > 3 mM: Toxicity likely.
      Concentration > 6 mM: Possibly severe, life-threatening toxicity.


Evaluation of benzoic acid toxicity in hyperamonemia and non-ketotic hyperglycinemia.


Stable isotope dilution gas chromatography-mass spectrometry (GC/MS).