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Test Code TSHC Thyroid Function Cascade with Reflex

Cerner Test Code

TSHC

Acceptable Collection Tube(s) or Specimen

Preferred: GRN PST

Acceptable: Gold SST

Specimen Draw Volume

Volume: 2.0 mL

Minimum Volume: 1.0 mL

Processing Instructions

Draw in a Green PST, centrifuge, and refrigerate.

Stability

Stability: Room Temp 24 hours, Refrigerated 2 days, Freeze up to 2 weeks (thaw once)

Performed Test Frequency

Everyday

CPT(s)

84443

Methodology

Chemiluminescence

Performing Location

MercyOne Des Moines Laboratory, Chemistry

Testing Algorithm

This test utilizes a cascaded testing procedure to efficiently evaluate and monitor functional thyroid status.

● If thyroid-stimulating hormone (TSH) is <0.549 mIU/L (18-150 yrs) or <0.652 mIU/L (0-18 yrs), then free T4 (FT4) is performed at an additional charge.

● If FT4 is normal and the TSH is <0.1 mIU/L, then triiodothyronine (T3) is performed at an additional charge.

● If thyroid-stimulating hormone (TSH) is 4.78 mIU/L (18-150 yrs) or >4.409 mIU/L (0-18 yrs), then FT4 and thyroperoxidase antibodies are performed at an additional charge.