T4 FREE
T4 (Thyroxine), Free, Serum or Plasma
EPIC Test Procedure Code: LAB2409
Performing Lab:
Saint Luke's Regional Laboratories
Container Type:
Serum gel tube or green top (heparin) tube
Specimen Type:
Serum or plasma
Preferred Volume:
2 mL
Minimum Volume:
0.5 mL
Collection Procedure:
1. Indicate serum or plasma on the request form.
2. Label the specimen appropriately (serum or plasma).
Store and Transport:
Room temperature
Limitations:
This test is not approved by the FDA for plasma. This specimen type was validated by Saint Luke's Regional Laboratories for use with the T4 Free assay. These results should be interpreted in correlation with other clinical evidence.
CPT Codes:
84439 - T4 Free (EAP 30015160)
Test Schedule:
Monday through Sunday
Method:
Chemiluminescence
Reference Ranges:
0 - 2 yrs:
0.94 - 1.44
ng/dL
> 2 - 13 yrs:
0.86 - 1.40
ng/dL
> 13 - 21 yrs:
0.83 - 1.43
ng/dL
> 21 yrs:
0.89 - 1.76
ng/dL