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HelpTest Code LAB137 Free T3
Performing Laboratory
Asante Rogue Regional Medical Center / Ashland Community Hospital
Specimen Minimum Volume
0.5 mL
Billing Code
2053155
Methodology
Chemiluminescence (CLIA)
Specimen Requirements
Day(s) Test Set Up
Monday through Sunday
Test Classification and CPT Coding
84481 - Triiodothyronine T3; free
Additional Information
The free fraction of the circulating triiodothyronine (T3) is considered to exert the main influence on metabolic control. In hyperthyroidism, FT3 concentrations are generally elevated. In hypothyroidism, FT3 concentrations tend to be lower, but the decrease is sometimes insufficient to give clear diagnostic information. FT3 concentrations are independent of the concentration of thyroid hormone-binding proteins, and may be measured in patients with elevated or reduced binding protein concentrations without the need for additional tests of binding capacity. FT3 determinations may be used as part of a thyroid test strategy, which may include free T4 and high sensitivity TSH assays.
Reasons for Rejection
Hemolysis
Quantity not sufficient (QNS)
Lack of Two Patient Identifiers:
1-Patient’s First & Last name
2-Patient’s Date of Birth
Performing Department
Chemistry
Specimen Transport Temperature and Stability
Centrifuge and refrigerate within 2 hours of collection
Serum stable 48 hours if aliquoted and refrigerated at 2° to 8° C
Freeze serum if testing is delayed
Avoid repeated freeze and thaw cycles