GDT - Specimen: Gadolinium, Dermal, Tissue

Test Catalog

Test Name

Test ID: GDT    
Gadolinium, Dermal, Tissue

Specimen Type Describes the specimen type validated for testing

Dermal Tissue

Specimen Required Defines the optimal specimen. This field describes the type of specimen required to perform the test and the preferred volume to complete testing. The volume allows automated processing, fastest throughput and, when indicated, repeat or reflex testing.


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

1. 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.

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

3. See Cautions for paraffin block information.

4. Paraffin blocks will be returned 3 days after analysis.

Specimen Minimum Volume The amount of sample necessary to provide a clinically relevant result as determined by the Laboratory.

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

Reject Due To Identifies specimen types and conditions that may cause the specimen to be rejected










Specimen Stability Information Provides a description of the temperatures required to transport a specimen to the laboratory. Alternate acceptable temperatures are also included.

Specimen TypeTemperatureTime
Dermal TissueRefrigerated (preferred)14 days
 Ambient 14 days
 Frozen 14 days