Prothrombin time
Coumadin, Panwarfin, Sofarin). It measures the time needed for clot formation after thromboplastin and calcium are added to plasma. Familiarly known as pro time.
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- Proto-oncogene
A normal gene which, when altered by mutation, becomes an oncogene that can contribute to cancer. Proto-oncogenes may have many different functions in the cell. Some proto-oncogenes provide signals that lead to cell division. Other proto-oncogenes regulate programmed cell death (apoptosis). The defective versions of proto-oncogenes, known as oncogenes, can cause a cell to divide […]
- Proton magnetic resonance spectroscopic imaging
Magnetic resonance spectroscopic imaging.
- Protozoa
A parasitic single-celled organism that can divide only within a host organism. For example, malaria is caused by the protozoa Plasmodium.
- Proximal
Toward the beginning, the nearer of two (or more) items. For example, the proximal end of the femur is part of the hip joint, and the shoulder is proximal to the elbow. The opposite of proximal is distal. For a more complete listing of terms used in medicine for spatial orientation, please see the entry […]
- Proximal white subungual onychomycosis
The rarest form of fungus infection of the finger or toenail. (Fungus infection of the finger or toenail is also called onychomycosis.) The infection begins in the nail fold (the portion of the nail opposite the tip of the finger). Proximal white subungual onychomycosis is typically associated with HIV infection (AIDS), though it can follow […]