Test Details

Mnemonic

LTE4

Ordering Code

3807700

CPT-4 Code(s)

82542

Specimen Information

Patient Preparation

If patient is taking Zileaton/Zyflo, discontinue for 48 hours prior to draw, if possible. Zileuton/Zyflo can reduce leukotriene 4 concentrations.
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Collect

Random urine
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Specimen Preparation

Send 4.0 mL urine refrigerated in a screw-capped plastic urine container. 24 hour or random urine collection is acceptable. No preservative.
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Alternate Specimen

Urine with preservative: 50% acetic acid, Na2CO3, Toluene, Boric acid, 24 hour urine
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Minimum Volume

1.0 ml
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Transport Temperature

Refrigerated
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Stability

Room temperature: 24 hours
Refrigerated: 7 days
Frozen: 30 days
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Methodology

Liquid Chromatography/Tandem Mass Spectrometry
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Reference Range

≤104 pg/mg creatinine
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Performing Laboratory

Mayo Clinic Laboratories
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New York DOH Approval Status

Yes
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