Feb 8, 2018




Clinical Hub,Tools & Resources,UWHC Lab Test Directory,Chemistry

T4, Total

T4, Total (T4) Chemistry Lab Test

Name: T4, Total

Test Name: T4, Total

Health Link Test Code: T4

LIS Test Code: T4

CPT Code(s): 84436

Methodology: Chemiluminescent Immunoassay

Days Performed: Daily, 24 hours.

In-Lab Turnaround Time: 4 hours.

Stat In-Lab Turnaround Time: 1 hour.

Specimen: Blood

Collection Container: Green cap with yellow ring (PST)

Also Acceptable: Green top, Red cap with yellow ring (SST), Red top

Collection Volume: 2 mL

Pediatric Collection Volume: 0.4 mL

Stability Refridgerated:

6 days

24 hours on gel

Stability Frozen:

>6 days

Sample Analyzed: Plasma or serum

Testing Volume: 1 mL

Pediatric Testing Volume: 0.2 mL

Specimen Processing:

Centrifuge. If a complete barrier has not formed, transfer cell-free plasma/serum to clear plastic vial. Refrigerate.

Specimen Transport:

Transport specimen to the laboratory. Transport with coolant pack if coming from clinic location.


Age ug/dL
1-8 years 6.2-10.3
9-11 years 5.5-9.3
12 years and up 4.9-11.7

Interpretation Type: Reference Interval