Test ID NMH1D N-Methylhistamine, 24 Hour, Urine
Ordering Guidance
A random urine collection is preferred for patients with episodic symptoms, for example in the context of allergic reactions, brought on by specific environmental factors. See NMHR / N-Methylhistamine, Random, Urine.
Specimen Required
Only orderable as part of a profile. For more information see
NMH24 / N-Methylhistamine, 24 Hour, Urine
Supplies: Sarstedt 5 mL Aliquot Tube (T914)
Container/Tube: Plastic, 5-mL tube
Specimen Volume: 5 mL
Collection Instructions:
1. Collect urine for 24 hours.
2. No preservative.
Additional Information:
See Urine Preservatives-Collection and Transportation for 24-Hour Urine Specimens in Special Instructions for multiple collections.
Useful For
Screening for and monitoring of mastocytosis and disorders of systemic mast-cell activation, such as anaphylaxis and other forms of severe systemic allergic reactions as a part of a profile
Monitoring therapeutic progress in conditions that are associated with secondary, localized, low-grade persistent, mast-cell proliferation and activation such as interstitial cystitis
Special Instructions
Method Name
Only orderable as part of a profile. For more information see:
NMH24 / N-Methylhistamine, 24 Hour, Urine
Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
Reporting Name
N-Methylhistamine, 24 Hr, USpecimen Type
UrineSpecimen Stability Information
Specimen Type | Temperature | Time | Special Container |
---|---|---|---|
Urine | Refrigerated (preferred) | 28 days | |
Ambient | 28 days | ||
Frozen | 28 days |
Reference Values
Only orderable as part of a profile. For more information see:
NMH24 / N-Methylhistamine, 24 Hour, Urine
0-5 years: 120-510 mcg/g creatinine
6-16 years: 70-330 mcg/g creatinine
>16 years: 30-200 mcg/g creatinine
Day(s) Performed
Tuesday, Thursday
Performing Laboratory

Test Classification
This test was developed, and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
82542
LOINC Code Information
Test ID | Test Order Name | Order LOINC Value |
---|---|---|
NMH1D | N-Methylhistamine, 24 Hr, U | 44340-8 |
Result ID | Test Result Name | Result LOINC Value |
---|---|---|
605159 | N-Methylhistamine, 24 Hr | 44340-8 |