Thyroid Panel

Test Code

Quest Code

7020

CPT Codes
84436, 84479

Includes

T₃Uptake,
T₄ (Thyroxine) Total
Free T₄ Index (T₇)

Preferred Specimen

1 mL serum collected in a serum separator tube (SST®)

Minimum Volume

0.5 mL

Other Acceptable Specimens

Plasma collected in a sodium or lithium heparin (green-top) tube

Transport Temperature

Room temperature

Specimen Stability

Room temperature: 7 days
Refrigerated: 7 days
Frozen: 28 days

Methodology
Immunoassay (IA)

Setup Schedule

Set up: Daily; Report available: Next day

Reference Range

T3 Uptake

22-35 %

T4 (Thyroxine), Total

	Male (mcg/dL)	Female (mcg/dL)
<1 Month	4.5-17.2	4.5-17.2
1-23 Months	5.9-13.9	5.9-13.9
2-12 Years	5.7-11.6	5.7-11.6
13-20 Years	5.1-10.3	5.3-11.7
>20 Years	4.9-10.5	5.1-11.9

Free T4 Index (T7)

1.4-3.8

Clinical Significance

For diagnosis of hypothyroidism and hyperthyroidism.

Performing Laboratory
Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly, VA 20153

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.