You are here: Home > TEST MENU and SEARCH Instructions > T > T4 Free

T4 Free

Last modified by  ivette_marrero  on  April 03, 2014 09:55 AM


UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514
Free T4; Thyroxine, Free
 
Tube Type
gold top serum separator tube
Test ID
 
FT4
Test Number
 
706
SMS Browse
 
T4 FREE
FREE T4
CPT Code(s)
 
84439
Group/Individual Test
 
Individual 
Laboratory
 
Core Laboratory
Tube Station
 
30
Specimen
Routine:
4 mL blood/serum separator tube/gold top
 
Micro:
2 microtainers/900 ┬ÁL blood
Availability
Routine:
24 hrs/day
 
STAT:
Yes
Turnaround Time
 
Routine: 2 hrs; STAT: 1 hr
Reference Range
Normal:
0.71 - 1.40 ng/dL, ambulatory adults.
See table below for other populations.
 
 
 
Comments
For additional specimen information refer to Core Laboratory Memorandum #46
Free T4 Reference Ranges (ng/dL)
Pediatric patients1
 
0 - 3 d
2.00-5.00
 
3 - 30 d
0.90-2.20
 
31 d - 18 y
0.80-2.00
 
 
 
Adults, ambulatory, healthy2
>18 y
0.71-1.40
Pregnant, euthyroid patients3
 
Levels trend 23-38% lower than the reference mean. The lowest point typically occurs ~34-36 w.
1. Dugaw KA, Jack RM, Rutledge J Pediatric reference ranges for TSH, free T4, total T4, total T3, and T3 Uptake on the Vitros ECi analyzer. Clin Chem 2001; 47: A108.
2. Reference range determined in-house
3. Lockitch G. Handbook of Diagnostic Biochemistry and Hematology in Normal Pregnancy. CRC Press. 1993.
 
 disclaimer text
Document Actions
Celebrate Laboratory Professionals Week 2014

Celebrate Lab Week 2014

Schedule of Events
(click on day)
Awareness Activities
(click on activity)
 
 
See Lab Week 2014
Continuing Education
Video Library-updated daily
(L:\LabResources\Lab Week\Lab Week 2014)
McLendon Clinical Laboratories Continuing Education & Training
Calendar  (Intranet only)
         Submit Event