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Concept
Polycythemia vera is an abnormal increase in blood cells, primarily red blood cells (polycythemia) but also white blood cells and platelets. As numbers of blood cells rise, the blood becomes thicker. This increases the risk for dangerous blood clots (thrombosis). The cause of polycythemia vera is a mutation in the blood...
Concept
Polyhydramnios is a condition in which there is too much fluid in the amniotic sac, the sac that holds the developing baby (fetus). This liquid is called amniotic fluid, and it surrounds the fetus throughout pregnancy. In many cases, the cause of polyhydramnios may not be found. But causes may include: Problems...
Concept
Polymerase chain reaction (PCR) is a type of test that can identify specific types of genetic material (DNA) in a small sample. PCR is useful for many purposes, such as for: Finding out what type of bacteria, virus, or fungus is causing an infection. Law enforcement, to identify a person who may have committed a...