Thyroid Cascade THCS

Method(s) LOCI
Specimen Required
Collect

One 5 mL gold (SST) top tube. Also acceptable: heparinized plasma.

Transport

1 mL serum at 2-8ºC.

Stability Refrigerated: 7 days.
Schedule Daily
Billing Code 1010102
CPTCode 84443 (If reflexed, 84439 and 84481)
Notes

TSH is performed. If the TSH is abnormal, a Free Thyroxine is performed. If Free Thyroxine is normal, then Free T3 is performed.

TSH may be falsely decreased and Free T4 and Free T3 may be falsely elevated in patients taking over-the-counter biotin supplements.

Preferred Specimen Collection Device(s)
No Appointment Necessary
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12 Patient Service Centers in Central New York.

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