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Antenatal Timing

Obstetrics

QuestionAnswer
What is the 1st trimester? 0-12 weeks
What is the 2nd trimester 13-28
what is the 3rd trimester 29-40
how is naegele's rule calculated? add 9 months, 7 days, or subtract 3 months add 7 days from the last menstrual period
how many days is in the naegele's cycle? 280 days
What are the parameters used in assessing GA? History (Naegele's rule, quickening), Examination (SFH, pelvic signs, foetal heart sounds), Ultrasound
What is the parameter used in a first trim U/s to assess GA? Crown to rump length
what is the parameter used in the 2nd & 3rd trim for GA? biparietal diameter and femur length
how accurate is crown to rump length? (days) +/- 5 days
how accurate is BPD and femur length? 2nd trim =/- 7-10 days, 3rd trim +/- 21 days
When is quickening felt in the 1. primigravid and 2. multigravid primigravid: 18-20 weeks, multigravid 16-18 weeks
SFH at pubic symphisis. How many weeks 12 weeks
SFH at xiphisternum. How many weeks? 38 weeks
SFH at umbilicus. How many wks? 20 weeks
Created by: IonaDel
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