Unit 2 KA4 - Antenatal and Postnatal Screening
What is antenatal screening?
It identifies the risk of a disorder so that further tests and a prenatal diagnosis can be offered
For Antenatal Screening there is a variety of...
Techniques that can be used to monitor the health of the mother, developing fetus and baby
Pregnant women are given teo ultrasound scans, what are they?
Dating scans
Anonaly Scans
When are dating scans carried out?
Between 8-14 weeks
What does a dating scan determine?
Pregnancy stage and due date
Dating scans are used with...
Tests for marker chemicals which vary normally during pregnancy
When is an anomaly scan performed?
Between 18-20 weeks
What do Anomaly scans detect?
Serious physical abnormalities in the fetus
Why are routine blood and urine tests carried put throughout the pregnancy?
to monitor the concentration of marker chemicals
What could measuring chemicals at the wrong time lead to?
A false positive result
An atypical chemical concentration can lead to diagnostic testing to determine if...
The fetus has a medical condition
What does a karyotype show?
The individuals chromosomes arranged as homologous pairs
What allow a karyotpe to be produced
Amniocentesis and CVS
When is CVS carried out
as early as 8 weeks
When is amniocentesis carried out
14-16 weeks
What is a disadvantage lf CVS?
There is more risk of a miscarriage compared to amniocentesis
In deciding to proceed with these tests the element of risk will be...
Assessed, as will the decisions the individuals concerned are likely to make if a test is positive