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Test Code TUPK T-Uptake, Plasma

Methodology

Electrochemiluminescence
Includes free thyroxine index (FTI).
Must order #T4 “T4 (Thyroxine), Total Only, Plasma,” in addition to #TUPK “T-Uptake, Plasma” for FTI calculation.

Performing Laboratory

St. Clair Hospital Laboratory

Specimen Requirements

1 plasma gel tube (1 mL of lithium heparin plasma). Centrifuge blood as soon as possible, or send unspun blood to laboratory within 4 hours of draw.

Reference Values

0.80-1.30 µg/dL
Low values may indicate hyperthyroidism. High values may indicate hypothyroidism.

Day(s) Test Set Up

Monday through Sunday