T3 UPTAKE

Message

Centrifuge within 2 hours of collection. If testing cannot be completed within 48 hours, freeze.

Test Code

TUP

CPT Codes
84479

Preferred Specimen

1 Gold tube (gel separator)

Minimum Volume

0.2 mL

Other Acceptable Specimens

1 Green tube (Lithium Heparin)

Instructions

Centrifuge for complete separation of plasma or serum and red cells within 2 hours. If testing cannot be completed within 48 hours, freeze serum or plasma.

Transport Temperature

Refrigerate or freeze

Specimen Stability

15-30°C up to 8 hours
2-8°C up to 2 days
Frozen samples are stable

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Serum or plasma not seperated from red cells.

Methodology

NCHB2 (Chemistry Beckman DxI)

Setup Schedule

M, T, W, Th, F, Sa, Sun

Report Available

Within 24 hours of receipt at the performing laboratory.

Reference Range

32.0 - 48.4%

Clinical Significance

Measures the thyroxine binding capacity of proteins in the blood and provides a measure of the available throxine-binding sites.

Performed By
Alverno Laboratories

Performing Laboratory
Alverno Central Lab
NCHB2 (Chemistry, Beckman DxI)

Last Updated: June 13, 2023

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.