To monitor the status of the fetus in the course of pregnancy doctors often prescribe the necessary tests and directs future mother on a regular survey. The nineteenth week of pregnancy – is a time to check the level of hemoglobin and blood sugar, as well as to pass urine for protein. Also, the expectant mother may be directed to pass tests for hormones, especially progesterone, the level of which depends on the preservation and the development of safe pregnancy.
If the test results instill concern, a doctor may offer to make screening, by which it is possible to determine fetal chromosomal abnormalities. Screening includes blood chemistry to a level of human chorionic gonadotropin, alpha-fetoprotein and unconjugated estriol.
Besides the biochemical analysis of blood a second screening includes an ultrasound, during which the doctor will determine the size of the nasal bones of the fetus and thickness for collar zone, assess the fetal heart rate and locomotor activity, diagnose the absence of pathology, examine the uterine myometrium, the size of the uterus and the fetus as well as the state of the amniotic fluid. During this ultrasound, you can find out the sex of the child.