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Leukotriene E4, urine-994

Test info

Test name:

Leukotriene E4, urine

Test number:

994

Excellian order number:

LAB994

Abbreviation:

MSO

Useful for:

An aid to evaluate patients suspected of having systemic mastocytosis Identification of aspirin sensitivity in patient respiratory diagnoses

Specimen

Patient preparation information:

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.

Specimen type:

Urine, 24 hr

Collection container:

24 hr urine collection container, no additive

Volume:

24 hr urine collection

Collection instructions:

How to collect a 24 hr urine sample

Processing instructions:

Record the total volume
Mix well
Pour a 4mL (minimum 1.0 mL) aliquot into a Screw cap transfer vial/tube (Mayo T914)

Transport container:

Mayo Screw Cap Transfer Vial (T914)

Alternate specimen type:

Urine, random

Alternate collection container:

Screw cap plastic container (non sterile)

Alternate processing instructions:

Transfer 4 mL of random urine to a Screw cap transfer vial/tube (Mayo T914)

Transport and stability:

Refrigerated (preferred) - 7 days

Frozen - 30 days

Ambient - 24 hours

Performance

Performing lab:

Mayo Clinic Laboratories (LTE4): R - NX

Days set up:

Tu, Fr

TAT:

2 - 6 days

Method:

Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)

Clinical and Interpretive info

Reference ranges:

≤ 104 pg/mg creatinine

Billing

CPT codes:

82542

Tracking

Date created:

06/03/2019

Revised date:

06/03/2019

Review date:

02/16/2021