THYROID CASCADE

Message

This test may have multiple reflex tests. See the testing algorithm below in Additional Information for further details.

Test Code

THYRC

CPT Codes
84443; 84439; 84480; 86376 will reflex as needed

Includes

TSH
If TSH is abnormal, reflex testing to T4F, T3T, or TPOAB will occur as needed.

Preferred Specimen

1 Gold tube (gel separator)

Minimum Volume

1.5 mL

Other Acceptable Specimens

1 Green tube (Lithium Heparin)

Instructions

Centrifuge within 2 hours of collection. Aliquot serum or plasma into a transfer tube if a gel separator .

Transport Temperature

Refrigerated

Specimen Stability

15-30°C up to 8 hours
2-8°C up to 7 days
Frozen samples are stable

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

Hemolyzed or lipemic samples will be rejected

Methodology
EIA (enzyme-linked immunoassay)

Setup Schedule

M, Tu, W, Th, F, Sa, Su

Report Available

Within 24 hours of receipt at the performing laboratory.

Reference Range

>0.270 - 4.200 uIU/mL (adult TSH reference range)

Clinical Significance

An order set that can be used as an aid in the diagnosis of hyper- or hypothyroidism.

Performed By
Alverno Laboratories

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

Additional Information
Thyroid Cascade Algorithm

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.