Test Code RLTE4 Leukotriene E4, Random, Urine
Specimen Required
Ordering Guidance
A 24-hour urine collection is the preferred specimen type. Order TLTE4 / Leukotriene E4, 24 Hour, Urine.
Specimen Required
Supplies: Sarstedt 5 mL Aliquot Tube (T914)
Container/Tube: Plastic vial
Specimen Volume: 5 mL
Collection Instructions:
1. Collect a random urine specimen.
2. No preservative preferred.
Useful For
An aid to evaluate patients suspected of having systemic mastocytosis using random urine collections
Profile Information
Test ID | Reporting Name | Available Separately | Always Performed |
---|---|---|---|
LTE4R | Leukotriene E4, Random, U | No | Yes |
CRETR | Creatinine, Random, U | No | Yes |
Method Name
LTE4R: Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
CRETR: Enzymatic Colorimetric Assay
Specimen Type
UrineSpecimen Minimum Volume
2 mL
Specimen Stability Information
Specimen Type | Temperature | Time | Special Container |
---|---|---|---|
Urine | Frozen (preferred) | 30 days | |
Refrigerated | 7 days | ||
Ambient | 24 hours |
Reject Due To
All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.Reference Values
LEUKOTRIENE E4
≤104 pg/mg creatinine
CREATININE
≥18 years old: 16-326 mg/dL
Reference values have not been established for patients who are younger than 18 years of age.
Day(s) Performed
Monday, Thursday
Report Available
2 to 6 daysPerforming Laboratory

Test Classification
This test was developed, and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
82542
82570