Methodology
Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS); Enzymatic Colorimetric Assay
Synonyms
1-Methylhistamine; Histamine Metabolites; Urinary N-Methylhistamine
Specimen Type
Urine, Timed Collection
Performing Lab
Mayo Medical Lab
Epic ID
Other Reference Test
Lab Test Days
Monday and Wednesday
Standard TAT
3-7 Days
Collection Information
Specimen Required
3-5 mL 24 Hour Urine
Container Type
24-Hour Urine Container
Collection Instructions
No preservative. Patient must not be taking monoamine oxidase inhibitors (MAOIs) or aminoguanidine as these medications increase N-methylhistamine (NMH) levels.
Processing Information - Lab Use Only
Transport Temperature
Refrigerate-OK/Frozen-OK/Ambient-OK
Specimen Stability
Room Temp=14 Days; Refrigerated=28 Days (Preferred); Frozen=28 Days
Test Volume Required
5 mL 24 Hour Urine
Minimum Test Volume
3 mL 24 Hour Urine
Processing Instructions
Total Volume required for timed urine collections. Order in Mayolink and send with Mayo courier Monday-Friday.
CPT Codes
82542
Revised
02-18-22
Initials
CL