Update Type: Reference range changed
Test Updated: 08/26/2026
Test Overview
Test Methodology

LC-MS/MS

Reference Range *

0 - 5 years: 85 - 369 mcg/g creatinine; 6-16 years: 48 - 238 mcg/g creatinine; >16 years: 19 - 143 mcg/g creatinine

Creatinine: Males: 930-2955 mg/24 hrs; Females: 603-1783 mg/24 hrs Reference values have not been estaablished for patients who are younger than 18 years

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details
Days Set Up
Monday, Wednesday, Friday
Analytic Time

4 - 9 days

Soft Order Code
NMH24
Synonyms
    Laboratory
    Sendout Testing
    Reference Laboratory
    Mayo NMH24
    Section
    Sendout Testing
    Specimen Requirements
    Collection

    Patient Preparation: Patient must not be taking monoamine oxidase inhibitors (MAOIs) or aminoguanidine as these medications increase N-methylhistamine (NMH) levels. Collect urine for 24 hrs. Aliquot and send to Specimen Processing refrigerated

    Normal Volume

    5 mL aliquot urine

    Minimum Volume

    3 mL aliquot urine

    Additional Information

    Test performed by Mayo Clinic Laboratories

    Billing
    CPT Code
    82542
    NY State Approved
    No