Test Catalog

Test ID: FET    
Iron, Liver Tissue

Testing Algorithm Delineates situations when tests are added to the initial order. This includes reflex and additional tests.

See Hereditary Hemochromatosis Algorithm in Special Instructions

Specimen Type Describes the specimen type validated for testing

Liver Tissue

Necessary Information

Patient's date of birth is required to calculate iron index.

Specimen Required Defines the optimal specimen required to perform the test and the preferred volume to complete testing

Supplies: Metal Free Specimen Vial (T173)

Container/Tube:

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

Acceptable: Paraffin block, if not more than 1 or 2 cuts have been made to it for slides

Specimen Volume: 2 mg

Collection Instructions:

1. Two mg of liver tissue is required. This is typically a piece of tissue from a 22-gauge needle biopsy at least 2 cm long. If an 18-gauge needle is used, the tissue must be at least 1 cm in length.

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.

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

Special Instructions Library of PDFs including pertinent information and forms related to the test

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

2 cm (22-gauge needle)
1 cm (18-gauge needle)
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

All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.

Specimen Stability Information Provides a description of the temperatures required to transport a specimen to the performing laboratory, alternate acceptable temperatures are also included

Specimen TypeTemperatureTimeSpecial Container
Liver TissueRefrigerated (preferred)
 Ambient 
 Frozen