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Test Code FREET3 Free T3

Additional Codes

LAB137

Methodology

Used to monitor thyroid function. Measures the amount of T3 not bound to globulins. Measurement of Free T3 is useful when Total T3 is altered due to changes in thyroid hormone binding proteins. Elevated serum Free T3 values are seen in hyperthyroidism.

 

Performing Laboratory

St. Mary's Regional Medical Center-Chemistry

 

CPT: 84481

Specimen Requirements

Submit only 1 of the following specimens:

 

Plasma

Container/Tube: Light green-top (lithium heparin) tube

Specimen: 1 mL of lithium heparin plasma

Transport Temperature: Ambient

Collection Instructions:

Note:

1. Indicate plasma.

2. Label specimen appropriately (plasma).

 

Serum

Container/Tube: Plain, red-top tube or serum gel tube

Specimen: 1 mL of serum

Transport Temperature: Ambient

Collection Instructions:

Note: 1. Indicate serum.

2. Label specimen appropriately (serum).

Reference Values

01-23 months: 3.34-5.24 pg/mL

02-12 years: 3.31-4.88 pg/mL

13-20 years: 2.91-4.53 pg/mL

>20 years: 2.18 - 3.98 pg/mL

Day(s) Test Set Up

Monday through Sunday