A B C D E F G H I J K L M N O P Q R S T U V W X Y Z #

T4, Total, Plasma or Serum

Test Code
T4


CPT Codes
84436

Preferred Specimen
Submit only 1 of the following specimens:


Plasma

Draw blood in a green-top (heparin) tube or a lavender-top
(EDTA) tube. Spin specimen down and send 0.5 mL
of plasma.

Note: 1. Indicate plasma.

2. Label specimen appropriately (plasma).


Serum

Draw blood in a plain, red-top tube or a serum gel tube. Spin
specimen down and send 0.5 mL of serum.

Note: 1. Indicate serum on request form.

2. Label specimen appropriately (serum).


Transport Temperature
Refrigerate up to 5 days hours/Frozen OK 


Methodology
Competitive Immunoassay

Setup Schedule
Monday through Sunday


Reference Range

4.5-12.0 µg/dL



Performed By
North Mississippi Medical Center Pathology Department

Performing Laboratory
NMMC Pathology Department



The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.