Liquid chromatography-tandem mass spectrometry (LC-MS/MS)
Rejection Criteria
Acidified samples
Room temperature samples
Samples submitted in preservative
Reference Range(s)
Age and gender specific normals
Specimen Requirements
Preferred Specimen
Urine collection container
Minimum Volume
1 mL urine
Sample Stability
Unacceptable room temperature 2 weeks refrigerated 6 months frozen
Transport Temperature
Frozen
Collection Instructions
24 hour urine refrigerated during collection. Record total
volume. Transfer 4 mL from a well-mixed 24 hr collection
to a plastic aliquot tube. Freeze. When multiple tests are
ordered, submit separate sample for this test.
Alternative Specimen
4 mL random urine (not preferred). Freeze. When multiple
tests are ordered, submit separate sample for this test.