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 in screw capped plastic vial.
Minimum Volume
3.0 mL
Transport Temperature
Refrigerated
Stability
Room temperature: 28 days
Refrigerated: 28 days
Frozen: 28 days
Refrigerated: 28 days
Frozen: 28 days
Methodology
NMH: Liquid Chromatography - Tandem Mass Spectrometry
Creatinine: Enzymatic Colorimetric Assay
Creatinine: Enzymatic Colorimetric Assay
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
6 - 16 years: 70 - 330 mcg/g creatinine
>16 years: 30 - 200 mcg/g creatinine
Performing Laboratory
MAYO
New York DOH Approval Status
Yes