Sign In
Regional Medical Lab
Test Directory


N-Methylhistamine, 24Hr Urine

Test Number: 3811100
Revision Date 08/12/2020
Test Name Methodology LOINC Code
N-Methylhistamine Level Urine
Liquid Chromatography/Tandem Mass Spectrometry 44340-8 
Creatinine Urine
Liquid Chromatography/Tandem Mass Spectrometry 2161-8 
NMH Creatinine Urine
Liquid Chromatography/Tandem Mass Spectrometry  
Collection Duration - Prompt
Collection Volume - Prompt
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 5mL (3mL) Urine, 24-hour 24 hour Urine Container Refrigerated
Instructions Mark Collection Duration and Total Volume on specimen and requisition.
Unacceptable: Random urine, specimen containing preservatives.
Patient Prep: Patient must not be taking monoamine oxidase inhibitors (MAOIs) or aminoguanidine as these medications increase N-methylhistamine (NMH) levels.
Specimen Prep: Testing is not performed at ARUP, therefore separate specimens are required for multiple tests.
Stability: Ambient: 2 weeks; Refrigerated: 28 days; Frozen: 28 days.
Testing Schedule Varies 
Expected TAT 3 -10 Days after setup  
Notes Reference Lab: ARUP
Test Code: 2011034
Click Here to view information on the ARUP website.
CPT Code(s) 82542
Lab Section Reference Lab