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Test Code T4 T4 (Thyroxine), Total, Serum or Plasma

Performing Laboratory

Huntsville Hospital Laboratory

Methodology

Enzyme Immunoassay (EIA)

Specimen Requirements

Container/Tube:

Preferred: Lithium heparin (light green-top)

Acceptable: Serum Gel

 Draw blood, spin down and send 1 mL (pediatric:  0.2 mL) of plasma or serum.

Specimen Stability Information

 

Specimen Type

Temperature

Time

Plasma,lithium heparin / Serum

RT, spun

4 days

  Refrigerated, spun 8 days

 

Reject Due To

 

Hemolysis

Mild:

ok

Gross:

ok

Lipemia

Mild:

ok

Gross:

ok

Icterus

Mild:

ok

Gross:

ok

 

Reference Values

 

Age

Male (µg/dL)

Female (µg/dL)

0 – 30 days

3.0 – 14.4

3.0 – 13.4

1 – 11 months

5.3 – 16.3

4.6 – 13.4

1 – 5 years

5.5 – 11.4

6.3 – 12.8

6 – 10 years

5.4 – 10.6

5.3 – 10.8

11 – 15 years

4.5 – 10.3

4.9 – 10.0

16 – 18 years

4.9 – 8.8

5.1 – 10.0

> 18 years

4.6 – 12.0

4.6 – 12.0

 

Day(s) Test Set Up

Monday through Sunday

CPT Coding

84436

Secondary ID

HHA1404

LOINC Coding

Test Name LOINC Code

T4 (Thyroxine), Total, Serum or Plasma

3026-2