Lab Test : T4

Print this page Bookmark and Share
Alternate:Thyroxine
Includes:T4
Department:Chemistry
Phone:(937) 641-3428
SQ Code:T4
Available:Mon - Fri, first shift only
Turnaround:24 hours
Specimen:Blood
Volume:0.7 mL
Container:4 mL red top tube
Temperature:Transport to lab within 30 minutes.
Rejection:Samples held at room temperature for more than 8 hours.
Normal:Males
1 month: 7.2-15.7g/Dl
1 year: 6.0-14.2 g/dL
10 yYears: 4.7-12.4 g/dL
21 years: 5.3-10.5 g/dL
Females
1 month: 7.2-15.7 g/dL
1 year: 6.0-14.2g/dL
10 years: 4.7-12.4g/dL
21 years:5.7-11.4 g/dL
Uses:T4 levels are useful in monitoring patients with hyperthyroidism; also used to screen for thyroid dysfunction.
Limitations:The anticonvulsant drug phenytoin may interfere with the total and free T4 levels due to competition for TBG binding sites.
Method:Competitive chemiluminescence immunoassay
 

Sign up for Pediatric Link

Finding the latest trusted child health and safety information doesn't have to be hard. Pediatric Link, Dayton Children's e-newsletter offers timely and up-to-date information for health care professionals from the experts you trust at Dayton Children's.  Sign up

Upcoming Events

Learn about healthy lifestyles including exercise and nutrition!

5k Run/Walk/Roll fundraiser for a universally accessible park

Car Seat Safety Check at Xenia Township Fire Station 51 on Brush Row Road

View full event calendarView full event calendar

The Right Experts

Just right for all kids

Accreditations

The Children's Medical Center of Dayton Dayton Children's
The Right Care for the Right Reasons

One Children's Plaza - Dayton, Ohio - 45404-1815
937-641-3000
www.childrensdayton.org