Thyroid Stimulating Hormone (TSH) with Reflex to Free T4

Message

Collect a full tube, following standard venipuncture techniques. Collect two full microtainers for infants <10 days old.

Test Code

LAB9560 TSHF

Alias/See Also

TSHF

CPT Codes
84443

Includes

TSH will reflex to T4 Free if the patient's result is >4.94 IU/mL OR <0.35 UI/mL.

Instructions

Processing Instructions (Lab use only): Centrifuge and separate cells after clot formation and within 4 hours of collection. Remove serum if testing will be delayed more than 24 hours. Minimum Testing Volume: 0.5 mL SerumTransport Temperature: Refrigerated Stability: TSH: Ambient: N/A Refrigerated (ON GEL): 24 hoursRefrigerated (OFF GEL): 7 daysFrozen: 28 daysFT4 - if reflexed: Ambient: N/A Refrigerated (ON GEL): 24 hoursRefrigerated (OFF GEL): 7 daysFrozen: > 6 days Causes for Rejection: Samples stored on gel >24 hours, unlabeled, mislabeled, wrong tube type, severely hemolyzed samples (hemolysis index >500), grossly lipemic samples (trig >3000mg/dl) and grossly icteric (bilirubin >20mg/dl), QNS, exceeds specimen stability requirements.

Clinical Significance

1230130218

Last Updated: May 18, 2026

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.