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Test ID TLCRU Thallium/Creatinine Ratio, Random, Urine

Useful For

Detecting toxic thallium exposure in random urine specimens

Method Name

TLCR: Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)

CDCR: Enzymatic Colorimetric Assay

Reporting Name

Thallium/Creat Ratio, Random, U

Specimen Type


Specimen Required

Patient Preparation: 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.

Supplies: Urine Tubes, 10 mL (T068)

Collection Container/Tube: Clean, plastic urine collection container with no metal cap or glued insert

Submission Container/Tube: Plastic, 10-mL urine tube (T068) or a clean, plastic aliquot container with no metal cap or glued insert

Specimen Volume: 2 mL

Collection Instructions:

1. Collect a random urine specimen.

2. See Trace Metals Analysis Specimen Collection and Transport in Special Instructions for complete instructions.

Specimen Minimum Volume

1.3 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Urine Refrigerated (preferred) 28 days
  Ambient  28 days
  Frozen  28 days

Reference Values

0-17 years: not established

≥18 years: <2 mcg/g creatinine

Day(s) Performed

Tuesday, Friday

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

83018 Thallium concentration

82570 Creatinine concentration

LOINC Code Information

Test ID Test Order Name Order LOINC Value
TLCRU Thallium/Creat Ratio, Random, U 13469-2


Result ID Test Result Name Result LOINC Value
CDCR Creatinine Concentration 2161-8
32870 Thallium/Creat Ratio, U 13469-2

Test Classification

See Individual Test IDs

Profile Information

Test ID Reporting Name Available Separately Always Performed
TLCR Thallium/Creat Ratio, U No Yes
CDCR Creatinine Concentration No Yes

Report Available

1 to 5 days

NY State Approved