THYROID STIMULATING HORMONE 3rd GENERATION w/ REFLEX FT4

Message

If the TSH is abnormal, this test will reflex to FT4

Centrifuge within 2 hours of collection.

Test Code

TSHPC

Alias/See Also

Thyrotropin

CPT Codes
84443

Includes

Abnormal TSH value will reflex to FT4

Preferred Specimen

1 Gold tube (gel separator)

Minimum Volume

1 mL

Other Acceptable Specimens

1 Green tube (Lithium Heparin)

Instructions

Centrifuge for complete separation of serum or plasma and red cells. Refrigerate until tested.

Transport Temperature

Refrigerate

Specimen Stability

2-8°C up to 7 days
-20° or lower up to 30 days

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

Quantity not sufficient

Methodology

ECLIA (EIA by Chemiluninescence)

Setup Schedule

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

Report Available

Within 24 hours of receipt at the performing laboratory.

Reference Range

TSH 0.270 - 4.200 µIU/mL
FT4 0.55 - 1.60 ng/dL

Clinical Significance

TSH is used to evaluate thyroid function; abnormal levels may indicate hyper- or hypothyroidism. In conjunction with FT4 levels, can determine if the feedback loop is intact.

Performed By
Alverno Laboratories

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

Last Updated: March 18, 2024

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.