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TSH Reflexing Cascade
MessageIf the TSH is less than 0.4, a FREE T4 will be ordered and if the
Free T4 is less than 2.1 a FT3 will be ordered.
If the TSH is greater than 4.0, a FREE T4 and a THYROID PEROXIDASE
ANTIBODY(TPO) will be ordered.
Free T4 is less than 2.1 a FT3 will be ordered.
If the TSH is greater than 4.0, a FREE T4 and a THYROID PEROXIDASE
ANTIBODY(TPO) will be ordered.
Test Code
TSHRFX
Alias/See Also
TSH Cascade
CPT Codes
84443
Includes
TSH with possible reflex to Free T4, T3 or Thyroid Peroxidase Antibody.
Preferred Specimen
Preferred specimen: 5 mL of whole blood. Minimum volume: 3 mL of whole blood
Transport Container
Serum Separator (gold top)
Specimen Stability
Stable 5 days refrigerated.
Methodology
See individual assays.
Setup Schedule
Set up daily.
Report Available
Inpatient turn around time: 8 hours for testing performed at St. Luke's. Outpatient testing received by noon will be reported by 4:30 p.m. Specimens received after noon will be reported by the next morning for testing performed at St. Luke's.
