Ordering Recommendation

Not recommended for routine thyroid screening; for initial thyroid disorder screening, refer to Thyroid Stimulating Hormone (0070145).

New York DOH Approval Status

This test is New York state approved.

Specimen Required

Patient Preparation
Collect

Serum Separator Tube (SST). Also acceptable: Lavender (K2 EDTA or K3 EDTA), Pink (K2 EDTA), or Green (lithium heparin).

Specimen Preparation

Allow specimen 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)

Storage/Transport Temperature

Refrigerated.

Unacceptable Conditions

Grossly hemolyzed specimens.

Remarks
Stability

After separation from cells: Ambient: 8 days; Refrigerated: 2 weeks; Frozen: 1 year

Methodology

Quantitative Electrochemiluminescent Immunoassay

Performed

Sun-Sat

Reported

Within 24 hours

Reference Interval

Cord blood 14-86 ng/dL
0-3 days 96-292 ng/dL
4-30 days 62-243 ng/dL
1-23 months 81-281 ng/dL
2-6 years 83-252 ng/dL
7-11 years 92-219 ng/dL
12-19 years 83-215 ng/dL
20 years and older 80-200 ng/dL

Interpretive Data



Compliance Category

FDA

Note

Hotline History

N/A

CPT Codes

84480

Components

Component Test Code* Component Chart Name LOINC
0070474 Triiodothyronine, Total (Total T3) 3053-6
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Aliases

  • T3 Total
  • Total T3
Triiodothyronine, Total (Total T3)