Liquid chromatography-tandem mass spectrometry (LC-MS/MS)
Rejection Criteria
Random urine samples
Reference Range(s)
Specimen Requirements
Preferred Specimen
24 hr urine collection container
Minimum Volume
3 mL urine
Sample Stability
14 days room temperature 28 days refrigerated 28 days frozen
Transport Temperature
Refrigerated
Collection Instructions
Collect all urine over a 24-hour period in provided container starting from the second void on the first day. Refrigerate urine during collection and record total volume. Transfer 5 mL urine from a well mixed 24 hour collection to a plastic aliquot tube. Refrigerate. Note: Monoamine oxidase inhibitors (maois) and aminoguanidine will increase n-methylhistamine levels.