Random Urine

Patient Prep: Diet, medication, and nutritional supplements may introduce interfering substances. Patients should be encouraged to discontinue nutritional supplements, vitamins, minerals, and non- essential over-the-counter medications (upon the advice of their physician). High concentrations of iodine may interfere with elemental testing. Collection of urine specimens from patients receiving iodinated or gadolinium-based contrast media should be avoided for a minimum of 72 hours post-exposure. Collection from patients with impaired kidney function should be avoided for a minimum of 14 days post-contrast media exposure.

Preferred Minimum: 8 mL random urine
Absolute Minimum: 1 mL random urine

Urine collected within 72 hours after administration of iodinated or gadolinium-based contrast media.

1-5 days upon receipt at reference laboratory

Lead, Urine - per volume: 0.0-5.0 μg/L
Lead, Urine - ratio to CRT: 0.0-5.0 μg/gCRT

Quantification of urine excretion rates before or after chelation therapy has been used as an indicator of lead exposure. Urinary excretion of >125 mg of lead per 24 hours is usually associated with related evidence of lead toxicity.

Quantitative Inductively Coupled Plasma-Mass Spectrometry

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