Obs Med: 25 Practice MCQs for MRCP Part 1
- Crack Medicine
- 2 days ago
- 5 min read
TL;DR
Obs Med: 25 Practice MCQs is a focused revision strategy for candidates preparing for MRCP Part 1, especially for commonly tested obstetric medicine themes such as hypertension, thromboembolism, diabetes, epilepsy, and liver disease in pregnancy. The exam usually tests practical decision-making, safe prescribing, and interpretation of physiological changes in pregnancy rather than obscure obstetric detail. This guide summarises the highest-yield topics, common traps, and exam-oriented revision techniques to improve accuracy under timed conditions.
Why Obstetric Medicine Matters in MRCP Part 1
The MRCP examination expects physicians to recognise and manage medical disease in pregnancy safely. Obstetric medicine is therefore tested across several systems including:
Cardiology
Endocrinology
Renal medicine
Respiratory medicine
Neurology
Pharmacology
Questions usually focus on:
Safe prescribing
Acute emergencies
Maternal versus fetal risk
Physiological adaptations in pregnancy
Interpretation of laboratory investigations
Candidates who revise Obs Med systematically often gain reliable marks because the same patterns recur repeatedly.
The 5 Most Tested Obstetric Medicine Topics
1. Hypertension in Pregnancy
Hypertensive disorders remain one of the most important and repeatedly tested topics.
Key Conditions
Condition | Timing | Main Features | Important Point |
Chronic hypertension | Before 20 weeks | Pre-existing hypertension | Increased pre-eclampsia risk |
Gestational hypertension | After 20 weeks | Hypertension without proteinuria | Usually resolves postpartum |
Pre-eclampsia | After 20 weeks | Hypertension with proteinuria/end-organ dysfunction | Risk of eclampsia |
Eclampsia | Seizures | Severe complication of pre-eclampsia | Magnesium sulphate treatment |
High-Yield Facts
Labetalol is commonly first-line treatment.
Methyldopa and nifedipine are also frequently used.
ACE inhibitors and ARBs are contraindicated.
Severe hypertension in pregnancy is an emergency.
HELLP syndrome may occur with only moderate hypertension.
Common Exam Trap
Many candidates incorrectly assume oedema alone confirms pre-eclampsia. In reality, oedema is common in normal pregnancy.
For guideline-based management principles, see the <a href="https://www.nice.org.uk/guidance/ng133" target="_blank" rel="noopener noreferrer">NICE guideline on hypertension in pregnancy</a>.
2. Venous Thromboembolism (VTE)
Pregnancy is a naturally hypercoagulable state.
Why VTE Risk Increases
Increased clotting factors
Reduced venous return
Endothelial injury during delivery
Reduced mobility postpartum
High-Yield Points
Low molecular weight heparin (LMWH) is preferred.
Warfarin is teratogenic during pregnancy.
D-dimer interpretation is unreliable in pregnancy.
Pulmonary embolism remains a major maternal cause of mortality.
Risk continues into the postpartum period.
Common Exam Trap
A “normal” D-dimer does not safely exclude pulmonary embolism in pregnancy.
3. Diabetes in Pregnancy
MRCP Part 1 commonly tests the distinction between:
Pre-existing diabetes
Gestational diabetes
Diabetic emergencies during pregnancy
Important Revision Points
Poor glycaemic control increases congenital malformation risk.
Macrosomia is common.
Polyhydramnios may occur.
Insulin requirements change throughout pregnancy.
Tight glucose control is essential before conception.
Common Exam Trap
Candidates often miss gestational diabetes when fetal macrosomia appears despite relatively mild maternal symptoms.
4. Epilepsy and Antiepileptic Drugs
This topic combines neurology with prescribing safety.
High-Yield Facts
Sodium valproate carries major teratogenic risk.
Lamotrigine is commonly used during pregnancy.
Folic acid supplementation is important.
Seizure control usually outweighs risks of stopping medication abruptly.
Drug levels may fluctuate during pregnancy.
Common Exam Trap
Abrupt withdrawal of antiepileptic therapy can be more dangerous than continued treatment.
For prescribing safety updates, refer to the <a href="https://bnf.nice.org.uk/" target="_blank" rel="noopener noreferrer">British National Formulary (BNF)</a>.
5. Liver Disease in Pregnancy
This is another classic MRCP Part 1 topic.
Conditions to Know
Condition | Typical Feature |
Intrahepatic cholestasis of pregnancy | Pruritus with raised bile acids |
HELLP syndrome | Haemolysis, elevated liver enzymes, low platelets |
Acute fatty liver of pregnancy | Liver failure and hypoglycaemia |
Key Clinical Clues
Cholestasis usually presents with itching rather than severe systemic illness.
HELLP syndrome may progress rapidly.
Acute fatty liver is associated with hypoglycaemia and encephalopathy.
Common Exam Trap
Candidates frequently confuse cholestasis with viral hepatitis.
Physiological Changes in Pregnancy You Must Know
A large proportion of Obs Med questions rely on recognising what is normal in pregnancy.
Common Physiological Changes
Increased plasma volume
Mild anaemia
Reduced systemic vascular resistance
Increased heart rate
Mild respiratory alkalosis
Elevated alkaline phosphatase
Increased GFR with lower creatinine
Important Interpretation Point
A creatinine level considered “normal” outside pregnancy may actually indicate renal impairment in a pregnant patient.
How to Approach Obs Med MCQs Efficiently
When answering a pregnancy-related question in MRCP Part 1, use this structured approach:
Identify gestational age.
Determine whether findings are physiological or pathological.
Consider maternal versus fetal safety.
Review contraindicated medications.
Prioritise emergency stabilisation if needed.
This simple framework prevents many avoidable errors during timed exams.
To practise timed questions, use the Crack Medicine <a href="https://www.crackmedicine.com/qbank" target="_blank" rel="noopener noreferrer">Free MRCP MCQ bank</a> and <a href="https://www.crackmedicine.com/mock-tests/" target="_blank" rel="noopener noreferrer">MRCP mock tests</a>.
Practical Mini-Case MCQ
A 29-year-old woman at 32 weeks’ gestation presents with headache, visual disturbance, and right upper quadrant pain. Blood pressure is 168/108 mmHg. Urinalysis shows proteinuria.
What is the most likely diagnosis?
A. Gestational hypertensionB. Acute fatty liver of pregnancyC. Pre-eclampsiaD. Intrahepatic cholestasis of pregnancyE. Chronic hypertension
Answer
C. Pre-eclampsia
Explanation
This is a classic presentation:
Hypertension after 20 weeks
Proteinuria
Visual symptoms
Right upper quadrant pain suggesting liver involvement
The patient has severe features and requires urgent assessment and treatment.
Study-Tip Checklist for Obs Med Revision
Focus Your Revision on These Areas
Revise physiological changes separately from pathology.
Memorise contraindicated drugs in pregnancy.
Learn first-line antihypertensive therapy.
Understand VTE investigation pathways.
Revise endocrine disease in pregnancy.
Focus on emergencies such as eclampsia and HELLP syndrome.
Practise interpretation-heavy MCQs.
Learn safe imaging modalities during pregnancy.
Review maternal mortality themes.
Complete regular timed question blocks.
Structured teaching videos can also help consolidate recurring themes. Explore the Crack Medicine <a href="https://www.crackmedicine.com/lectures" target="_blank" rel="noopener noreferrer">MRCP Part 1 lectures</a> for guided revision.
Common Pitfalls in Obstetric Medicine Questions
Confusing physiological pregnancy changes with pathology
Forgetting ACE inhibitors are contraindicated
Assuming D-dimer safely excludes pulmonary embolism
Missing HELLP syndrome when blood pressure is only moderately elevated
Abruptly stopping antiepileptic medication
FAQs
How important is obstetric medicine in MRCP Part 1?
Obs Med is a moderate-yield topic but overlaps significantly with cardiology, endocrinology, renal medicine, and pharmacology. Efficient preparation can secure reliable marks.
What is the best way to revise Obs Med MCQs?
Focus on repeated themes such as hypertension, thromboembolism, diabetes, epilepsy, and liver disease in pregnancy. Timed question practice is usually more effective than passive reading.
Are drug contraindications commonly tested?
Yes. MRCP Part 1 frequently tests safe prescribing in pregnancy, especially ACE inhibitors, warfarin, sodium valproate, and tetracyclines.
Do I need detailed obstetrics knowledge for MRCP Part 1?
No. The exam focuses on physician-relevant medical management during pregnancy rather than detailed obstetric procedures.
Which Obs Med emergencies should I prioritise?
Pre-eclampsia/eclampsia, pulmonary embolism, HELLP syndrome, and acute fatty liver of pregnancy are particularly important high-yield emergencies.
Ready to start?
Strengthen your preparation with structured revision via the MRCP Part 1 overview. Practise actively using the Free MRCP MCQs and simulate exam conditions with a Start a mock test.
For deeper understanding, combine this guide with lecture-based revision at:https://www.crackmedicine.com/lectures/
Sources
MRCP(UK). Official examination information.
NICE Guideline NG133: Hypertension in pregnancy.
British National Formulary (BNF).
Royal College of Obstetricians and Gynaecologists (RCOG).
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