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Test Code THYROID FUNCTION CASCADE THYROID FUNCTION CASCADE

Department

Chemistry

Specimen Type

Plasma or serum

Method

Immunoenzymatic Assay

Container

Lithium heparin (green-top) or No additive with gel (gold top)

Standard Volume

3ml

Minimum Volume

3ml

Pediatric Volume

1.5ml

Ship Temperature

Room Temperature

Stability Refrigerated

48 hours

Stability Room Temp

8 hours

Stability Frozen

5 days

CPT Code

84443

Days Test Set Up

Monday through Sunday

Group Components

TSH
Free T4 if TSH is <0.45 or Free T4 and TPO if TSH is >5.33
Total T3 if the Free T4 is normal with a TSH <0.10

Reflexive Disclosure

Initial TSH test will be run.
If TSH is <0.45 a Free T4 will be run; or
If TSH is <0.10 a Free T4 will be run; if normal a Total T3 will be run
If TSH is >5.33 a Free T4 and TPO will be run. Additional CPT codes if appropriated: 84439(if appropriate), 84480(if appropriate), 86376 (if appropriate)