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Test Code FT3 T3 (Triiodothyronine), Free, 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 0.5 mL (pediatric:  0.2 mL) of plasma or serum.

Specimen Stability Information

 

Specimen Type

Temperature

Time

Plasma,lithium heparin / Serum

RT, spun

5 days

 

Refrigerated, spun

7 days

 

Reject Due To

 

Hemolysis

Mild:

ok

Gross:

ok

Lipemia

Mild:

ok

Gross:

ok

Icterus

Mild:

ok

Gross:

ok

 

Reference Values

 

Age

Male and Female (pg/mL)

0 – 3 days

1.4 – 5.4

4 – 30 days

1.4 – 5.5

1 – 11 months

2.0 – 6.9

1 – 5 years

2.4 – 6.7

6 – 10 years

2.7 – 6.2

11 – 15 years

2.6 – 5.9

16 – 18 years

2.8 – 5.7

> 18 years

2.6 – 4.4

 

Day(s) Test Set Up

Monday through Sunday

CPT Coding

84481

Secondary ID

HHA1296

LOINC Coding

Test Name LOINC Code

T3 (Triiodothyronine), Free, Serum or Plasma

3051-0