Back to Test Directory

0151 : T4 (Thyroxine) Total


Alternate Name:
Utilidad clínica:
"thyroxine (T4) is used along with T3 to assess thyroid function. Produced by the thyroid gland, its regulation is controlled by a complex feedback mechanism. Decreasing levels of T4 causes increased production of TSH and TRH by the hypothalamus and pituitary respectively. Therefore, there is an inverse relationship between the Total T4 level and TSH in a patient with an intact thyroid and a normally functioning pituitary axis "
Electrochemiluminescence Immunoassay


Código de la prueba:
Tiempo de entrega de los resultados:
1 days
Preferred Specimen:
1 mL SST Tube
Alternative Specimen:
Red Top,Microtainer - Pediatric SST,Aliquot Tube-Serum,Microtainer - Pediatric Red,Aliquot Serum- Red Top
Collection Instructions:
Fill tube, invert gently 5 times, label with patient name, let stand for minimum of 30 minutes, maximum of 1 hr, spin for 10-15 minutes
Storage Instruction:
Scarlet Eligible:


CPT Codes:
84436 (1)

CPT Code Disclaimer

The CPT codes provided are based on AMA guidelines and are for informational purposes only.
La codificación CPT es responsabilidad exclusiva de la parte que factura. Please direct any questions regarding CPT coding to the payer being billed.