Ordering Recommendation

Not recommended for routine thyroid screening.

Mnemonic
T4
Methodology

Quantitative Electrochemiluminescent Immunoassay

Performed

Sun-Sat

Reported

Within 24 hours

New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation
Collect

Serum separator tube or plasma separator tube. Also acceptable: Lavender (EDTA).

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: 4 days; Refrigerated: 8 days; Frozen: 1 year

Reference Interval
Cord blood 6.60-17.50 µg/dL
0-3 days 5.37-22.40 µg/dL
4-30 days 5.24-23.20 µg/dL
1-23 months 5.37-16.00 µg/dL
2-6 years 5.26-14.80 µg/dL
7-11 years 5.70-14.10 µg/dL
12-19 years 4.74-14.60 µg/dL
20 years and older 5.10-14.10 µg/dL

Interpretive Data



No compliance statements are in use for this test.

Note
Hotline History
N/A
CPT Codes

84436

Components
Component Test Code* Component Chart Name LOINC
0070140 Thyroxine 3026-2
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
  • Syn-Thyroid
  • T4
  • T4 Total Only, T4, Serum
  • Tetraiodothyronine
  • Thyroid Hormone
  • Thyroxine (T4)
  • Total T4
Thyroxine