T3 (TRIIODOTHYRONINE) UPTAKE

LAB4080

Collect

Serum separator tube. Also acceptable: Plasma separator tube, lavender (EDTA), pink (K2EDTA), or green (sodium or lithium heparin).

Specimen Preparation

Allow serum to clot completely at room temperature. Separate serum or plasma from cells ASAP or within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.5 mL)

Unacceptable Conditions

Grossly hemolyzed specimens.

Storage/Transport Temperature

Refrigerated.

Stability (from collection to initiation)

After separation of cells: 8 days; Refrigerated: 2 weeks; Frozen: 2 years

Notes

T3 uptake is of little clinical value alone; it is used to determine the Free Thyroxine Index.

Performed

Sun-Sat

Methodology

Quantitative Electrochemiluminescent Immunoassay

Reported

Within 24 hours

Synonyms

  • THBR
  • Thyroid Binding Ratio
  • T-Uptake
  • Triiodothyronine Uptake, Serum
  • T3U, Serum
  • T3 Uptake, S
  • LAB4080
  • T3 UP

Ordering Recommendations

Not recommended for routine thyroid screening.

Reference Interval

28-41% uptake

Interpretive Data

Thyroxine, Free (Free T4) (0070138) is the preferred test alternative for T3 uptake and Free Thyroxine Index tests.

CPT Codes

84479
Collection

LAB4080

Collect

Serum separator tube. Also acceptable: Plasma separator tube, lavender (EDTA), pink (K2EDTA), or green (sodium or lithium heparin).

Specimen Preparation

Allow serum to clot completely at room temperature. Separate serum or plasma from cells ASAP or within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.5 mL)

Unacceptable Conditions

Grossly hemolyzed specimens.

Storage/Transport Temperature

Refrigerated.

Stability (from collection to initiation)

After separation of cells: 8 days; Refrigerated: 2 weeks; Frozen: 2 years

Notes

T3 uptake is of little clinical value alone; it is used to determine the Free Thyroxine Index.
Ordering

Performed

Sun-Sat

Methodology

Quantitative Electrochemiluminescent Immunoassay

Reported

Within 24 hours

Synonyms

  • THBR
  • Thyroid Binding Ratio
  • T-Uptake
  • Triiodothyronine Uptake, Serum
  • T3U, Serum
  • T3 Uptake, S
  • LAB4080
  • T3 UP

Ordering Recommendations

Not recommended for routine thyroid screening.
Result Interpretation

Reference Interval

28-41% uptake

Interpretive Data

Thyroxine, Free (Free T4) (0070138) is the preferred test alternative for T3 uptake and Free Thyroxine Index tests.

Administrative

CPT Codes

84479

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