Zip Code 23803 Population. 23803 is located in the state of Virginia in the Richmond metro area. Zip code 23803 is primarily located in Chesterfield County. Portions of 23803 are also located in Dinwiddie County.The official postal service name used for 23803 is PETERSBURG, Virginia.ip Code 23803 Area Codes. 23803 is located in the state of Virginia in the Richmond metro area. Zip code 23803 is primarily located in Chesterfield County. Portions of 23803 are also located in Dinwiddie County.
Cytomel (T3) is rarely prescribed on its own to address thyroid problems; it is usually prescribed with T4. In the past, cytomel was a scheduled treatment for obesity; however, an increase in heart complications and cardiac stress forced withdrawal of T3 for that application.
A free T4 test may be used along with or following a TSH test and sometimes with a free T3 test to: 1  Help detect too much or too little thyroid hormone (hyperthyroidism and hypothyroidism) and diagnose the cause.2  Distinguish between different thyroid disorders. 3  Help diagnose pituitary disorders. free T4 test may be used along with or following a TSH test and sometimes with a free T3 test to: 1  Help detect too much or too little thyroid hormone (hyperthyroidism and hypothyroidism) and diagnose the cause.