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HelpTest Code CTSHC Thyroid Cascade Profile
Additional Codes
LAB5431
Methodology
| Profile Information: | |
| T3 (Triiodothyronine), Total | Thyroid-Stimulating Hormone (TSH) |
| T4 (Thyroxine), Free | |
Recommended as the most cost-effective protocol to screen for and diagnose thyroid disease.
The testing sequence for this test begins with a TSH. If the TSH is abnormal (either low or high), an order for a free T4 is reflexed. If the TSH result was low and the free T4 result is normal, a total T3 is reflexed.
Performing Laboratory
St. Mary's Regional Medical Center-Chemistry
CPT: 84443 (TSH)
Additional CPT's are added if reflex tests are done
Specimen Requirements
Submit only 1 of the following specimens:
Plasma
Container/Tube: Light green-top (lithium heparin) tube
Specimen: 1 mL of lithium heparin plasma
Transport Temperature: Ambient
Collection Instructions:
Note:
1. Indicate plasma.
2. Label specimen appropriately (plasma).
Serum
Container/Tube: Plain, red-top tube or serum gel tube
Specimen: 1 mL of serum
Transport Temperature: Ambient
Collection Instructions:
Note:
1. Indicate serum.
2. Label specimen appropriately (serum).
Reference Values
See individual test listings.
Day(s) Test Set Up
TSH, Free T4: Monday through Sunday
Total T3: Monday through Friday