The potential sources of bias are: 1  Some households use cellphones only and have no landline. 2  Some people may not be contactable by landline from Monday to Friday and may be contactable only by cellphone. 3  Some people use their landlines only to access the Internet, and answer calls only to their cellphones.
A thyroid panel is used to evaluate thyroid function and/or help diagnose hypothyroidism and hyperthyroidism due to various thyroid disorders. The panel typically includes tests for: 1  Thyroid-stimulating hormone (TSH) 2  Free thyroxine (free T4)  Total or free triiodothyronine (total or free T3)
What are thyroid function tests? The usual blood tests done for thyroid function are TSH, T4 and sometimes T3. A blood sample is taken from a vein in the arm and sent off to the laboratory for analysis. Usually the âfreeâ or active portion of T4 and T3 is measured (i.e., FT4 and FT3).