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Methodology: Electrochemiluminescent Immunoassay (ECLIA)
Edit Date: 11/20/2009
Components: Thyroid Panel (T7) / T3 Uptake / Thyroxine
Performed: Daily
Released: 24-48 hours after setup at PeaceHealth Laboratories’ reference lab.
CPT Code: 84436-90 / 84479-90
Specimen Collection Details
Collection: Note: Order only by specific request for T7. Collect one 7.5 mL serum separator tube (SST).
Handling: Allow to clot, centrifuge and immediately separate serum from cells into a plastic vial.
Stability: 24 hours ambient, 7 days refrigerated, or 30 days frozen.
Standard Volume: 1 mL serum.
Minimum Volume: 0.5 mL serum.
Transport: Refrigerated.
Comments: Thyroxine (TF4), Free (40050) has emerged as a more commonly ordered replacement for this panel over the past decade.
Rejection Criteria: Grossly hemolyzed specimen.

Reference Range:
Components Age Interval
Thyroid Panel T7 FTI 1.7-4.2
T3 Uptake 28-41% uptake
Thyroxine Cord blood 6.6-17.50 µg/dL
0-3 days 5.37-22.40 µg/dL
4-30 days 5.24-23.20 µg/dL
1 -23 months 5.37-16.00 µg/dL
2-6 years 5.26-14.80 µg/dL
7-11 years 5.70-14.10 µg/dL
12-19 years 4.74-14.60 µg/dL
20 years and older 5.10-14.10 µg/dL
FTI=Free Thyroxine Index

PeaceHealth Laboratories