NIH / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY NIH / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Chorionic villi sample. Coloured digitised light micrograph of a sample of chorionic villi. The branched chorionic villi (blue/pink) are seen in a field of red blood cells (yellow dots). The villi are extensions of the placenta which present a large surface area to the maternal blood supply. Chorionic villi contain foetal blood vessels, and are a part of the foetal tissue. Sampling of this tissue, known as chorionic villi sampling (CVS), is usually conducted between 9-12 weeks of pregnancy to evaluate the chromosomal and DNA status of the foetus. CVS is a way of diagnosing abnormalities in a foetus in early pregnancy.
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