Antenatal and Postnatal Screening Flashcards
What is antenatal screening?
Pre-birth- identifies the risk of disorder do that further tests and a prenatal diagnosis can be offered.
What is postnatal screening?
After birth- diagnose metabolic or genetic disorders in the baby.
What is involved in antenatal screening?
General health checks, Ultrasound, Biochemical marker tests in blood, Diagnostic testing, Rhesus antibody testing.
General health tests.
Blood iron level tests, Urine tests, blood pressure, weight and height.
Ultrasound.
High frequency sound waves bounce off the fetus to project and image on a screen.
When are the two times you can get an ultrasound?
8-14 weeks dating scan
18-20 weeks anomaly scan
Biochemical tests.
Medical conditions can be detected by a range of marker chemicals that indicate a condition.
What are examples of biochemical tests that are taken?
HCG levels and protein levels.
Diagnostic tests.
Usually definitive but require an examination of the karyotype of the fetus cells.
What is the karyotype?
Refers to the number of structure of chromosomes in an organism.
Chorionic
K immediately- 20 minutes
2% miscarriage risk
taken at 8-12 weeks
Amniocenteis
Cells cultured then stained
very small risk of infection
0.5% miscarriage risk
Not 100% reliable
Rhesus antibody testing
Antigens on the surface on the RBC is determined by parents.
What is involved in postnatal screening?
Diagnostic for metabolic disorders, Genetic screening and counselling,
