Sign in →

Test Code GDT Gadolinium, Dermal, Tissue

Reporting Name

Gadolinium, T

Useful For

Evaluation of dermal tissue for gadolinium

Performing Laboratory

Mayo Medical Laboratories in Rochester

Specimen Type

Dermal Tissue

Advisory Information

This test is useful for evaluation of dermal tissue. No other tissue types have been validated. The reference range applies only to dermal tissue. Fresh, refrigerated, or frozen tissue is preferred.


If tissue is other than dermal tissue, see MSCM / Miscellaneous Metals Testing.

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: Metal Free Specimen Vial (T173)


Preferred: Mayo metal-free specimen vial (blue label) (T173)

Acceptable: Paraffin block is also acceptable if not more than 1 or 2 cuts have been made to it for slides.

Specimen Volume: 2 mg

Collection Instructions:

1. 2 mg of tissue from a skin-punch biopsy is required, at least 2 mm in diameter and 2 mm in depth.

2. Any specimen vial other than a Mayo metal-free vial used should be plastic, leached with 10% nitric acid for 2 days, rinsed with redistilled water, and dried in clean air.

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

Additional Information: Paraffin blocks will be returned 3 days after analysis.

Specimen Minimum Volume

0.5 cm (14-gauge needle)
1 cm (18-gauge needle)
2 mm x 2 mm (punch)
0.3 mg by dry weight

Specimen Stability Information

Specimen Type Temperature Time
Dermal Tissue Refrigerated (preferred) 14 days
  Ambient  14 days
  Frozen  14 days

Reference Values

<0.5 mcg/g

Day(s) and Time(s) Performed

Wednesday; 11 a.m.

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
GDT Gadolinium, T 80643-0


Result ID Test Result Name Result LOINC Value
29249 Gadolinium, T 80643-0

Method Name

Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)