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)
A TSH test is frequently ordered along with or preceding a free T4 test. Other thyroid tests that may be ordered include a free T3 test and thyroid antibodies (if autoimmune-related thyroid disease is suspected). Sometimes TSH, free T4 and free T3 are ordered together as a thyroid panel.TSH testing is used to: 1  Diagnose a thyroid disorder in a person with symptoms.2  Screen newborns for an underactive thyroid.ometimes TSH, free T4 and free T3 are ordered together as a thyroid panel. TSH testing is used to: 1  Diagnose a thyroid disorder in a person with symptoms. 2  Screen newborns for an underactive thyroid.