Our blueprint estimate puts 15–20 of the 200 questions in data interpretation, about 8.8% of the paper, spread across both papers. It is our estimate, not a figure published by the RCOG. One of the heaviest-weighted areas on the paper.
15–20
of 200
9
in our syllabus map
measurement_manipulation
3 other areas
Data interpretation questions hand you a result, a table or a graph and ask what follows. The skill is applying pregnancy-adjusted reference ranges and reading effect measures correctly, not recalling a fact.
The 9 syllabus topics we map to Data Interpretation for Part 1.
Blood gas, full blood count, renal and thyroid results all shift in pregnancy. A creatinine that would reassure in a non-pregnant patient can be a warning here, and a low carbon dioxide level can be normal.
Maternal Physiological Changes in Pregnancy Data Interpretation for MRCOG Part 1
Free rather than total thyroid hormones are interpretable in pregnancy. Liver tests need the same care: some enzymes have a placental source and others do not.
Reproductive Endocrinology Biochemistry for MRCOG Part 1 Management of Thyroid Disorders in Pregnancy
Find the line of no effect first, then check whether the interval crosses it. Read the size of the effect separately from its precision.
Convert counts into a two-by-two table before calculating. Check whether the question is about the test or about the person who has just tested positive, because the second depends on prevalence.
Data Interpretation for MRCOG Part 1 Statistics and Epidemiology for MRCOG
Treat every result as a puzzle with a gestational age attached. Keep a single sheet of pregnancy-adjusted ranges beside you and consult it before answering. For graphs and forest plots, say aloud what the axes are, where the line of no effect lies and what the interval tells you, before you look at the answer options.
Part 1 is 200 single best answer questions across two papers with no negative marking, so an informed guess always beats a blank. Data interpretation is one of the highest-yield areas in our blueprint estimate. It draws on physiology, endocrinology and statistics, so it is a good test of whether those areas have actually been learned.
Every question is original and written from published RCOG and NICE guidance, and every explanation cites the guideline it came from. Free: 5 days full access, then 50 questions. No card.
Published RCOG and NICE guidance summarised for revision, with the source cited on every page.
MRCOG AI is an independent educational tool. It is not affiliated with, endorsed by, or connected to the Royal College of Obstetricians and Gynaecologists (RCOG).