KA4- Antenatal Screening Flashcards
1) Antenatal screening identifies… 19
the risk of a disorder so that further tests and a prenatal diagnosis can be offered
2) Ultrasound imaging
a) Dating scans
b) Anomaly scans
2a) Dating scans which can take place… determines… used with… 30
between 8 and 14 weeks which determines pregnancy stage and due date are used with tests for marker chemicals which vary normally during pregnancy
2b) Anomaly scans which take place… may detect… 18
between 18 and 20 weeks which may detect serious physical abnormalities in the foetus
3) Routine… to monitor… 18
blood and urine tests are carried out throughout pregnancy to monitor the concentration of marker chemicals
4) … at the wrong time.. 13
Measuring chemicals at the wrong time could lead to a false positive result
5) An atypical concentration … 17
can lead to diagnostic testing to determine if the foetus has a medical condition
6) Diagnostic testing:
a)CVS
b)Amniocentesis
6a) CVS involves.. using… 21
taking a tiny samples of placental cells using a fine tube inserted into the mothers reproductive tract
6b) Amniocentesis involves… 8
withdrawing amniotic fluid contains foetal cells
7) CVS can be… though… 17
carried out earlier in pregnancy than amniocentesis though has a higher risk of miscarriage
8) Cells from samples can… to diagnose… 20
can be cultured to obtain sufficient cells to produce a karyotype to diagnose a range of conditions
9) A karyotype shows… 10
an individual’s chromosomes arranged as homologous pairs
10) In deciding to proceed with these tests, … , … 29
the risk of element is assessed, as will the decisions the individuals concerned are likely to make if a test is positive
