Skip to main content
We are experiencing exceptionally high volumes in our emergency rooms.
Every patient is important to us, and we are doing all we can to provide care quickly and efficiently.
Skip to main content
Go to homepage

T4 Thyroxine Total Only, Serum

Centralized Core Laboratory : Chemistry

Test ID/Workstation :
Specimen Type:
Blood - Serum
Tube Type:
Gold Top SST (Serum Separator Tube)
Collection Volume:
2.5 mL (minimum 1.5 mL)
Cause for Rejection:
Grossly hemolyzed specimens will be rejected
Sent to Reference Lab performed Monday through Friday 5am-12am, Saturday 6am-6pm
Electrochemiluminescence Immunoassay
Special Instructions:
Patient Prep - 12 hrs before blood test do not take multivitamins or dietary supplements containing biotin (Vit B7).
1-3 days
Additional Info:
Reference Range: See reference lab ranges on report
CPT Code:
Syn-Thyroid T4, Serum Tetraiodothyronine Thyroid Hormone Thyroxine, Total T4 Total Only, S Thyroxine Thyroxine
Summit Mall Play Area
Answer Key:
Click to expand
There are 10 nurses in the picture.

And we have many more pediatric primary care providers in Northeast Ohio. You can meet some of them here.
Summit Mall Play Area
Answer Key:
Click to expand
The five differences are:
– Phone color
– Coat pocket
– Stethoscope earpiece color
– Stethoscope bell dot
– Clipboard paper color

Need help finding a doctor, choosing a location or getting a general question about Akron Children's answered? Call us or fill out the form and we'll help in any way we can.
Summit Mall Play Area
Answer Key:
Click to expand
The two matching doctors are 9 and 14.

With virtual visits, you can see our pediatric experts from the comfort of home or wherever you are.
Summit Mall Play Area
Answer Key:
Click to expand
The correct path:
The Correct Path
We offer many ways to get pediatric care all over Northeast Ohio. Use this page to find the right kind of care and the most convenient location for you.