Antenatal Care and Screening Flashcards
How is sensitivity of a screening test calculated?
True positive / (positive + false negative)
How is specificity of a screening test calculated?
True negative / (negative + false positive)
Which investigations are carried out at the booking visit?
Hb Rhesus Syphilis; HIV; Hep B&C Urinalysis USS
How does the clinician know if the pregnancy is continuing?
If they can see a heart on USS
What should be suspected if there is no embryo in the uterus?
Ectopic pregnancy
Which syndromes can be picked up as part of screening for Down’s?
Edwards’ and Patau’s
Edwards’ syndrome is trisomy 18. True/false?
True
Patau’s syndrome is trisomy 16. True/false?
False - trisomy 13
What occurs in placenta praevia?
When the placenta is low lying in the womb and covers all/part of the cervix
What tests can be done to assess the risk of Down’s in the first trimester?
Nuchal translucency
Beta-HCG
What blood tests are done to assess risk of Down’s in the second trimester?
Assay of HCG and AFP
What specific diagnostic tests are done for Down’s syndrome?
Amniocentesis
Chorionic villus sampling
What is the main risk of amniocentesis and chorionic villus sampling?
Miscarriage
What major haemotological disorders are screened for in antenatal care?
Sickle cell disease
Thalassemias
Women with which risk factors should be offered screening for gestational diabetes?
BMI >30
Previous baby weighing >4.5kg
Previous gestational diabetes
FHx of diabetes