Azoospermia: No sperm at all. The ejaculate is completely devoid of sperm.
By contrast, in oligospermia (literally, few sperm) there are some sperm, but fewer than normal.
Azotemia: A higher-than-normal blood level of urea or other nitrogen-containing compounds. The hallmark test for azotemia is the serum blood urea nitrogen (BUN) level. Azotemia is usually caused by the inability of the kidneys to excrete these compounds.
AZT: Azidothymidine, now renamed zidovudine, but still best known by the abbreviation AZT. This antiviral drug is prescribed, usually in combination with protease inhibitors and other drugs, to treat HIV infection in patients with AIDS.
- AV (atrioventricular)
AV (atrioventricular): AV is the standard medical abbreviation for atrioventricular, a combination that means pertaining to the atria (the upper chambers of the heart) and the ventricles (the lower chambers of the heart). For example, the AV node is an electrical relay station between the atria and the ventricles. Electrical signals from the atria must […]
- B. quintana
B. quintana: Also called Rochalimaea quintana), Bartonella quintana is an unusual rickettsial organism that can multiply within the gut of the body louse and then can be transmitted to humans. Transmission to people can occur by rubbing infected louse feces into abraded (scuffed) skin or into the conjunctivae (whites of the eyes). Bartonella quintana (B. […]
- b.i.d. (on prescription)
b.i.d. (on prescription): Seen on a prescription, b.i.d. means twice (two times) a day. It is an abbreviation for “bis in die” which in Latin means twice a day. The abbreviation b.i.d. is sometimes written without a period either in lower-case letters as “bid” or in capital letters as “BID”. However it is written, it […]