
	3D Medical Animations Close This information is provided by an independent source. Merck & Co. does not endorse and is not responsible for the accuracy of the content, or for the practices or standards of non-Merck sources. This information provided is not intended to be a substitute for professional medical advice. A licensed healthcare professional should be consulted for diagnosis and treatment of any and all medical conditions. The manufacturer of a product generally has the most complete information about that product. How to use How to use The world's largest library of 3D medical animations developed and copyrighted by Blausen Medical Communications. The Human Atlas figures rotating model, labeled slides, and printable text in addition to animated videos. Shows a video of the selected health topic. Controls play, pause, and restart of the video. Shows a summary of the selected health topic. Controls to scroll the text. Shows a 3 D model of the video. Controls to rotate the model. Shows slides from the video. Controls to change slides.

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This information is provided by an independent source. Merck & Co., Inc. is not responsible for this content. Please discuss any and all treatment options with your healthcare professional. The manufacturer of a product generally has the most complete information about that product.

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Rh factor any of numerous genetically determined antigens (agglutinogens) found on the surface of erythrocytes; there are at least eight different ones. If one of the factors is present in an individual's erythrocytes, the blood type is called Rh positive (D positive, Rh₀); if the factor is absent, the blood type is called Rh negative (D negative, dd, or Hr₀ ). Most people are Rh positive. The presence or absence of an Rh factor is especially important in blood transfusions; mixing of two types of blood may result in agglutination of red blood cells and plugging of capillaries. If a pregnant woman is Rh negative and the fetus in the womb is Rh positive, the newborn baby may develop erythroblastosis fetalis.

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