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Test Code FET Iron, Liver Tissue

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type

Liver Tissue


Necessary Information


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



Specimen Required


Supplies: Metal Free Specimen Vial (T173)

Container/Tube:

Preferred: Mayo metal-free specimen vial

Acceptable: Paraffin block, with no more than 1 or 2 cuts previously made

Specimen Volume: 2 mg

Collection Instructions: Two mg of liver tissue are 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.

Specimen Stability Information:

Fresh or formalin-fixed liver tissue specimens: Frozen (-30 to -10° C) at least 20 years

Paraffin-embedded (block) liver tissue specimens: Ambient (16 to 24° C) at least 12 1/2 years

Additional Information: Paraffin blocks will be returned 7 days after analysis is complete.


Specimen Minimum Volume

Needle biopsy: See Specimen Required; 2 mm x 2 mm (punch): 0.3 mg by dry weight

Specimen Stability Information

Specimen Type Temperature Time
Liver Tissue Refrigerated (preferred)
  Ambient 
  Frozen 

Reference Values

Iron

Males: 200-2,400 mcg/g dry weight

Females: 200-1,800 mcg/g dry weight

 

Iron Index

≥13 years: <1.0 mcmol/g/year

Reference values have not been established for patients that are younger than 13 years.

Day(s) Performed

Monday, Thursday

CPT Code Information

83540

Report Available

3 to 6 days

Specimen Retention Time

60 days

Reject Due To

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