Gestational Landmarks Flashcards
Delivery of multiple pregnancy
Monochorionic twins: 35 weeks
Triplets: 33 weeks
Viability
28 weeks, 1000g
26 weeks, 800g
Betamethasone administration
<34 weeks
Rhesus antibody testing
26, 32 and 36 weeks
Oral glucose tolerance testing
28 weeks
Kick counting
> 28 weeks
Cerclage
14-24 weeks
Antiphospholipid syndrome treatment
6-14 weeks: heparin
14-36 weeks: warfarin
>36 weeks: heparin
Ultrasound
Early: 11-14 weeks
Fetal anomaly: 18-23 weeks
Down’s triple test
16-18 weeks
Chorionic villus sampling
11-14 weeks
Amniocentesis
15-23 weeks
Post dates
> 40 weeks
Post term
> 42 weeks
Antibody production
IgG - 17 weeks
IgM - 30 weeks
Fetal movements felt
Nulliparous: 18-20 weeks
Multiparous: 16-18 weeks
Progesterone production
1-10 weeks - corpus luteum (supported by LH initially, which is gradually taken over by β-hCG from the 8th day)
From week 7, the placenta begins to take over progesterone production, with the placenta being the only source from week 12
32 weeks - the fetal adrenal production of progesterone commences
Liquor volume
Increases up to 34 weeks
Gradually decreases until 40 weeks
Sharply decreases to 42 weeks
NST
> 26 weeks
