Test directory: N-Methylhistamine, 24 Hour, Urine

Ordering Code 7989
Test Name N-Methylhistamine, 24 Hour, Urine
Alias Urinary N-Methylhistamine
Preferred Specimen Urine, 24 Hour
Preferred Container 24 Hour Urine Container
Optimum Volume 5 mL
Collection Instructions Patient must not be taking monoamine oxidase inhibitors (MAOIs) or aminoguanidine as these medications increase
N-Methylhistamine (NMH) levels.
Handling Instructions Specimen volume and duration are required.
Transport Requirements Oahu: Ambient
Airline: Refrigerated
Specimen Stability Ambient: 14 Days
Refrigerated: 28 Days
Frozen: 28 Days
Avail. Stat NO
Analytic Time 10 Days
Methodology NMH1D: Liquid Chromatography-Tandem Mass
Spectrometry (LC-MS/MS) CRT24; Enzymatic Colorimetric Assay
Reference Lab  Mayo Medical Lab

Reference range(s)

The reference ranges listed below are valid on this date of June 29, 2025.
Component Age Male Norm Male Critical Low Male Critical High Female Norm Female Critical High Female Critical Low Units Add'l info
Collection Duration ALL See report.
Urine Volume ALL See report.
Creatinine, 24 Hr, U ALL See report.
Creatinine Concentration, 24 Hr, U ALL See report.
N-Methylhistamine, 24 Hr ALL See report.