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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)

Container/Tube:

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

83018

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

Clinical Information

Gadolinium is a member of the lanthanide series of the periodic table of elements and is considered a nonessential element. Due to its paramagnetic properties, chelated gadolinium is commonly employed as contrast media (gadolinium-based contrast agents: GBCA) for magnetic resonance imaging and computer tomography scanning.

 

Gadolinium is primarily eliminated via the kidneys, so exposure can be prolonged in patients with renal insufficiency. In healthy subjects with normal renal function, the plasma half-life of gadolinium is approximately 90 minutes (1.5 hours). Patients with reduced renal function and some patients with normal renal function may exhibit a prolonged gadolinium elimination half-life.

 

To date, the only known adverse health effect related to gadolinium retention is a rare condition called nephrogenic systemic fibrosis (NSF). NSF is a relatively uncommon condition in which fibrous plaques develop in the dermis and, often, in deeper connective tissues. Reported cases have occurred almost exclusively in patients with severe renal disease, and almost all have been associated with prior use of GBCAs. NSF is a painful skin disease characterized by thickening of the skin, which can involve the joints and cause significant limitation of motion within weeks to months. Over the past decade, changes in clinical practice guidelines have almost completely eliminated the incidence of NSF. However, the association of NSF and observed elevated gadolinium concentrations is still not fully understood.

Analytic Time

2 days

NY State Approved

Yes

Method Name

Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)