T4 (THYROXINE), TOTAL ONLY, BLOOD

Electrochemiluminescence Immunoassay (ECLIA)

 

Test Performed At:

 

 

St Louis Children's Hospital

 

Specimen Required:

 

 

Collect 1.0 mL (minimum 0.6 mL) of whole blood in a green-top (lithium heparin) tube(s); a red top serum gel tube(s) or a plain, red top tube(s).

 

Laboratory Notes:

 

 

Spin and separate. Refrigerate specimen if received after cut-off time.

 

 

NOTE:

Will also accept EDTA plasma

 

Reference Values:

 

 

3-6 days:

11.0-21.5 mcg/dL

 

 

1 week-1 month:

8.2-16.6 mcg/dL

 

 

³1 month-1 year:

6.5-14.5 mcg/dL

 

 

³1-5 years:

6.0-13.5 mcg/dL

 

 

³5-15 years:

5.0-12.0 mcg/dL

 

 

³15 years:

4.5-12.0 mcg/dL

 

 

 

 

Day(s) Test Set Up:

 

 

 Sunday-Friday

 

Cut-Off Time:

 

 

2000

 

Turn Around Time:

 

 

Same day; next day if received after cut-off time

 

CPT Code:

 

 

84436

 

Care Manager Order Name:

 

 

Thyroxine (T4), Total ONCE RTN

 

KIDDOS Order Name:

 

 

Thyroxine (T4), Total

 

Cerner Order Name:

 

 

T4 Totl

 

 Last updated 06/09