Rh factor
An antigen found in the red blood cells of most people: those who have Rh factor are said to be Rh positive (Rh+), while those who do not are Rh negative (Rh-) Blood used in transfusions much match donors for Rh status as well as for ABO blood group, as Rh- patients will develop anemia if given R+ blood. Rh typing is also important during abortion, miscarriage, pregnancy, and birth, as mother and fetus may not be Rh-compatible. Rh stands for rhesus monkeys, in whose blood this antigen was first found. See also RhoGAM, Rh incompatibility.

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Rh factor 'är-'āch- n a genetically determined protein on the red blood cells of some people that is one of the substances used to classify human blood as to compatibility for transfusion and that when present in a fetus but not in the mother causes a serious immunogenic reaction in which the mother produces antibodies that cross the placenta and attack the red blood cells of the fetus called also rhesus factor

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Rhesus factor any of numerous antigens (agglutinogens) that may be present on the membrane of erythrocytes and that determine the Rh blood group system; the most common ones are called (in one system) Rh 1, Rh 3, Rh 4, Rh 5, and Rh 21. See Rh blood group, under blood group. Called also Rh antigen.

Medical dictionary. 2011.

Look at other dictionaries:

  • Rh factor — ☆ Rh factor [är′āch′ ] n. [ RH(ESUS): from having been discovered first in the blood of rhesus monkeys] a group of antigens, determined by heredity and usually present in human red blood cells, which may cause hemolytic reactions during pregnancy …   English World dictionary

  • RH factor — (= Rh factor) Rhesus factor: see rhesus blood group …   Dictionary of molecular biology

  • Rh factor — Rh factor. См. резус фактор. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Rh factor — 1942, from the first letters of RHESUS (Cf. rhesus); so called because the blood group, and its effects, were discovered in the blood of rhesus monkeys (1941) …   Etymology dictionary

  • Rh-factor — ● rhesus …   Useful english dictionary

  • Rh factor — noun a blood group antigen possessed by Rh positive people; if an Rh negative person receives a blood transfusion from an Rh positive person it can result in hemolysis and anemia • Syn: ↑rhesus factor, ↑Rh • Hypernyms: ↑antigen * * * noun also rh …   Useful english dictionary

  • Rh factor — [[t]ɑ͟ːr e͟ɪtʃ fæktə(r)[/t]] N UNCOUNT The Rh factor is the same as the rhesus factor …   English dictionary

  • Rh factor — Rh fac|tor [ ,ar eıtʃ ,fæktər ] noun singular MEDICAL a substance found in the red blood cells of most people. People who have it are called RH positive and cannot share blood with people who do not, who are called RH negative …   Usage of the words and phrases in modern English

  • RH factor — RH fac|tor [ˌa:r ˈeıtʃ ˌfæktə US tər] n [singular] the ↑Rhesus factor …   Dictionary of contemporary English

  • Rh factor — /arˈeɪtʃ fæktə / (say ahr aych faktuh) noun an agglutinogen often present in human blood. Blood containing this factor (Rh positive) may cause haemolytic reactions, especially during pregnancy or after repeated transfusions with blood lacking it… …   Australian English dictionary

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