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Thyroid Function Screen
MessageTSH will be tested and if increased or decreased, FT4, TT3, and/or TPOAb may be reflexed as indicated.
Test Code
TSHRF
Alias/See Also
LAB0001124
TSH
FT4
TT3
TPOAb
TSH
FT4
TT3
TPOAb
CPT Codes
84443
Preferred Specimen
2.0 mL serum collected in a gold serum separator tube (SST)
Minimum Volume
1.0 mL serum
Other Acceptable Specimens
2.0 mL serum collected in an orange rapid clot serum separator tube (RCT)
Specimen Stability
Store centrifuged samples tightly stoppered at room temperature 15 - 30oC for no longer than eight hours. If the assay will not be completed within eight hours, refrigerate the samples at 2 - 8oC. If the assay will not be completed within 48 hours, or for shipment of samples, freeze serum at -20oC or colder.
Reference Range
See individual tests for Reference Ranges
Performing Laboratory
Penn Medicine Lancaster General Health
Additional Information
FT4 Reference Range
TPOAb Reference Range
TSH Reference Range
TT3 Reference Range