Here are 10 MCQs to test/revise a few key concepts from the lecture on Methods of Dating a Pregnancy. Good luck!
Reviewed by Jonathan Loomes-Vrdoljak
Methods of Dating a Pregnancy
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How many weeks is term?
Depends on the pregnancy
From which week is the developing embryo referred to as a foetus?
How many weeks is 1st trimester?
Which weeks for the 2nd trimester?
13 weeks to term
What are the 3 common methods of dating a pregnancy?
Obstetric calendar wheel, Naegele's Rule, USS
Obstetric calendar wheel, Naegele's Rule, Symphysio fundal height
Obstetric calendar wheel, USS, Symphysio fundal height
Naegele’s Rule, USS, Symphysio fundal height
Naegele’s Rule, CT Scan, Symphysio fundal height
Which of the following is true of Naegele's Rule?
Assumes a 21 day cycle and uses first day of last menstrual period (LMP)
Assumes a 24 day cycle and uses last day of last menstrual period (LMP)
Assumes a 24 day cycle and uses first day of last menstrual period (LMP)
Assumes a 28 day cycle and uses first day of last menstrual period (LMP)
Assumes a 28 day cycle and uses last day of last menstrual period (LMP)
A 34 year old female presents to the GP as she has had a positive pregnancy test. She would like to book in for routine antenatal care with the surgery’s midwife. She tells you her LMP was on the 10th of August and her cycle is usually 30 days. What is the estimated date of delivery? (Use Naegele's Rule)
Question 7 Explanation:
To calculate the estimated due date (EDD) using Naegele's Rule, you:
- Subtract 3 months from start of last menstrual period
- Add one year
- Add seven days
This assumes a 28-day cycle. As this expectant mother normally has a 30-day cycle, some sources/textbooks indicate you should add or subtract the difference. In this case, 30 - 28 = 2, so you add 2 to get the EDD.
However, remember that the EDD is still advisory. It can be influenced by several factors including how regular a woman's periods are, ethnicity, weight, parity. Source: https://dx.doi.org/10.1111/ajo.13253
Where do we measure from and to using ultrasound for the crown-rump length?
Top of the head to the bottom of the buttocks
Top of the head to the bottom of the heel
Top of the fontanelle to the bottom of the buttocks
Top of the fontanelle to the bottom of the heel
Top to bottom
When is symphysio-fundal height measured from?
How do you measure symphysio-fundal height?
Xiphoid process down to the pubic symphysis
Uterine fundus down to the pubic symphysis
Xiphoid process down to the ASIS
Uterine fundus down to the ASIS
Xiphoid process down to the PSIS
Question 10 Explanation:
Remember TOP-DOWN! And hold the measuring tape with the blank side facing up.
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There are 10 questions to complete.