Test Details

Mnemonic

NMHR

Ordering Code

3800107

CPT-4 Code(s)

82542, 82570

Specimen Information

Patient Preparation

Patient must not be taking monoamine oxidase inhibitors (MAOIs) or aminoguanidine as these medications increase N-methylhistamine levels.

Collect

Random urine

Specimen Preparation

Collect specimen within a few hours of symptom onset. Send 5.0 mL refrigerated in screw capped plastic vial.

Minimum Volume

3.0 mL

Transport Temperature

Refrigerated

Stability

Room temperature: 28 days
Refrigerated: 28 days
Frozen: 28 days

Methodology

NMH: Liquid Chromatography - Tandem Mass Spectrometry
Creatinine: Enzymatic Colorimetric Assay
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Reference Range

0 - 5 years: 120 - 510 mcg/g creatinine
6 - 16 years: 70 - 330 mcg/g creatinine
>16 years: 30 - 200 mcg/g creatinine
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Performing Laboratory

Mayo Clinic Laboratories
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