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HelpTest Code THYRCASC Thyroid Function Cascade, Thyroid Profile
Specimen Requirements
1.0 ml serum, or plasma. Red, Gold and Green top tubes acceptable.
Specimen Stability
Refrigerated - 7 days
Frozen - 30 days
Testing Performed
Low and Borderline Low TSH reflex to Free T4
High TSH reflexes to T3
Coding
TSH CPT 84443
FREE T4 CPT 84431
T3 CPT 84480
Reference Range
0 - 0.09 Low
0.10 - 0.26 Borderline Low
0.27 - 4.20 Normal
4.21 - 99999 High