Test Overview

Test Methodology

Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)

Test Usage

Detecting toxic thallium exposure.

Reference Range*

Blood: 0 - 1 ng/mL; Urine: Less than 10 mcg/specimen (24 hr collection).

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details

Days Test Performed

Monday - Saturday

Analytic Time

2 - 4 days

Soft Order Code


MiChart Code

Thallium, Urine



Laboratory Reference

Mayo 8149 Blood, Mayo 8603 Urine

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Specimen Requirements

Offsite Collection Instructions

Blood: Collect blood in 7 mL royal blue top (metal free) tube with EDTA (K2). Refrigerate intact specimen. Heparinized specimens are unacceptable. Urine: Collect 24 hour urine in a clean, plastic container with no metal cap or glued insert and no preservative. Aliquot urine into a clean, plastic container with no metal cap or glued insert and refrigerate within 4 hours of completion of collection. Record 24 hour urine volume and collection dates/times on the request form. Collection must take place prior to or 96 hours after administering gadolinium-containing contrast media.


High concentrations of gadolinium and iodine are known to interfere with most metals tests. If either gadolinium- or iodine-containing contrast media has been administered, a specimen should not be collected for 96 hours.


24-hour Urine Jug

Normal Volume

Blood: 7 mL whole blood. Urine: 10 mL aliquot of 24 hour urine collection.

Minimum Volume

Blood: 0.3 mL whole blood. Urine: 1 mL aliquot of 24 hour urine collection.

Additional Information

Thallium is a by-product of lead smelting and is found in some depilatories and rodenticides. Thallium is rapidly absorbed via ingestion, inhalation, skin contact, and through mucous membranes. Test sent to Mayo Medical Laboratories.

Billing Information

Fee Codes

CPT Code

83789 each specimen

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