Patient's question:
Had an amniocentesis, received the results on January 19th, please ask the doctor to analyze the amniocentesis results?Amniocentesis done at 20 weeks, results received three weeks later:
Routine test cell count: 20
Routine test mode: 46/47
G-banding analysis results: 46,XX[17],XX,+12[3]
Doctor's answer:
Amniocentesis is a method of prenatal diagnosis. It is generally suitable for prenatal diagnosis during the second trimester of pregnancy. Amniotic fluid exists in the amniotic cavity; the fertilized egg forms the amniotic cavity on the seventh day after fertilization and begins to produce amniotic fluid. At 12 weeks of pregnancy, the volume of amniotic fluid is 50 milliliters, at 20 weeks it is 400 milliliters, and at 36-38 weeks it is 1,000-1,500 milliliters, slightly decreasing as the due date approaches.Guidance:
Amniocentesis is a type of invasive prenatal diagnosis. Generally, we first take the mother's blood for screening. After screening, if the mother is reported to have a certain risk level, it indicates the likelihood of a child with abnormalities. In newborns, if no screening or intervention is performed, among normal newborns, approximately 1 in 700 children will have this condition. Now, with screening, by examining the relevant baseline values in the mother's blood, we set a general indicator. If the risk reaches 1 in 250, meaning there is a 1 in 250 chance that the mother is carrying a child with trisomy 21, we recommend amniotic fluid testing. This involves directly collecting the cells that have fallen from the child's epidermis into the amniotic fluid, culturing them, and then examining their chromosomes to determine if there are any additional ones. This is how the condition is diagnosed.