test directorySearch Results
Click here to search again.
Test Name:
T3 Uptake
- SBMF No:
44636 - Performance Lab Name:
ARUP Laboratories - Test Mnemonic:
T3 UPTAKE - ABN:
May be required – Medical Necessity - CPT Code:
84479 - LOINC Code:
3050-2 - Ref Lab Test No:
0070135 - Also See:
30113 T4, Free
30017 Thyroid Stimulating Hormone, Sensitive
44637 Thyroid Panel - Spec Type:
Serum - Spec Container:
Gold top (SST) or red top (serum) tube - Alt Spec Type:
Plasma - Alt Spec Container:
Green top (heparin) or Lavender top (EDTA) tube - Pref Vol:
1.0 mL - Min Vol:
0.5 mL - Fasting:
No - Spec Collect:
Routine venipuncture - Spec Process:
Serum sample tubes, allow blood to clot completely at room temperature
Promptly centrifuge 15 minutes
Immediately transfer serum or plasma to separate plastic tube - Spec Store Transport:
Refrigerated - Spec Stability:
After separation from cells:
24 hours room temperature (20-30°C)
8 days refrigerated (2-8°C)
3 months frozen (-20°C) – Do not use frost-free units that undergo repeated freeze/thaw cycles - Spec Reject:
Grossly hemolyzed sample - Spec Remarks:
Separate serum or plasma from cells ASAP - Methodology:
Electrochemiluminescent Immunoassay (ECLIA) - Use:
Obsolete test
Thyroxine, Free (Free T4) (30113) is the preferred test alternative for T3 uptake and Free Thyroxine Index tests - Clinical Significance:
Refer to:
- Reference Range:
28-41% uptake
Note:
T3 uptake is of little clinical value alone; it is used to determine the Free Thyroxine Index. - Day Run:
Sun-Sat (daily) - Time Reported:
1-2 days - Test Type:
HORMONE
