When studying the epidemiology of most infectious diseases (such as influenza), the agents are risk factors such as smoking, high blood pressure, or exposure to chemicals or radiation.

________ Renal threshold is the concentration at which a substance such as glucose excreted by the kidneys begins to appear in the urine

Indicate whether the statement is true or false

The specialty of obstetrics deals with pregnancy, labor, delivery, and postpartum. It is often combined with ________. A practice that specializes in both is referred to as OB/GYN.

Fill in the blank(s) with the appropriate word(s).