T Uptake
| Abbrev Code: | TUP | ||
| Order Code: | LAB8280 | Order Name: | T Uptake |
| Synonyms: | T3 Uptake | ||
| Methodology: | Quantitative Electrochemiluminescent Immunoassay | ||
| CPT Codes: | 84479 x1 | ||
| Turnaround Time: | Specimens sent to reference laboratory Mon-Sat; results are reported within 2 days. | ||
Collection Instructions
| Specimen: | Blood |
| Optimal Volume: | 3 mL |
| Minimum\Peds Volume: | 1.2 mL |
| Container: | Red or gold (gel) Alternate Containers: Green (lithium heparin, gel), Purple (EDTA) |
| Causes for Rejection: | Gross hemolysis |
Processing and Shipping
| Specimen Processing: | Allow specimen to clot completely at room temperature. ASAP, or within 2 hours of collection, centrifuge and aliquot 1 mL, 0.5 mL minimum. Store in refrigerator. |
| Shipping Instructions: | Ship at refrigerated temperature. |
| Stability: | After separation from cells, 8 days at room temperature; 2 week refrigerated; 2 years frozen. |
| Test Performed at or Referral Lab | Lab Sendouts (ARUP) |
| Referral Lab number: | 3005977 |
Interpretive
| Reference Range: | 0.8-1.3 TBI |
| Use: | Thyroxine, Free (Free T4) is the preferred test alternative for T Uptake and Free Thyroxine Index tests. T Uptake is of little clinical value alone. |
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