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HelpTest Code T-CAS Thyroid Cascade, Serum
Performing Laboratory
North Ottawa Community Hospital/Mayo Medical Laboratories
Specimen Requirements
Specimen Type: Serum
Container/Tube: Serum gel or red top
Specimen Volume: 2 mL
Collection Instructions: Avoid hemolysis and lipemia.
Reference Values
See individual test listings.
Day(s) Test Set Up
Monday through Sunday: T4, free; TSH
Monday through Saturday: TPO; T3
Methodology
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| Test Code | Published Name |
| TSH | Thyroid-Stimulating Hormone (TSH), Ultra-Sensitive |
| Reflex Tests: | |
| FT3 | T3 (Triiodothyronine) Free, Plasma or Serum |
| T4FREE | T4 (Thyroxine), Free |
Testing Algorithm:
If TSH is decreased, then Free T4 (FT4) is performed at an additional charge. If FT4 in normal, then a Free T3 (FT3) is performed at an addional charge.
If TSH is elevated, then FT4 is performed at an additional charge.
Method Name:
FT3: Competitive Immunoassay
T4FREE, TSH: Bichromatic Rate
Specimen Transport Temperature
Ambient
Test Classification and CPT Coding
84443-TSH
84439-T4, free (if appropriate)
84480-T3, total (if appropriate)