Aid in the initial evaluation of suspected cases of mast cell activation disorders.
Quantitative Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
Patients taking 5-lipoxygenase inhibitor Zileuton/Zyflo may have decreased concentrations of leukotriene E4 (LTE4) if dosage has not been discontinued for 48 hours. If possible, discontinue for 48 hours before testing.
24-hour urine. Also acceptable Random urine.
Refrigerate specimen during collection. Transfer 4 mL urine to an ARUP Standard Transport Tube. (Min: 1 mL)
Refrigerated. Also acceptable: Frozen.
Ambient: 24 hours; Refrigerated: 1 week; Frozen: 1 month
Performed by non-ARUP Laboratory
|Component Test Code*||Component Chart Name||LOINC|
- Cysteinyl Leukotriene
- Systemic mast Cell Activation
Mayo Clinic Laboratories