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Endo: 50 High-Yield Facts for MRCP Part 1

TL;DR

Endo: 50 High-Yield Facts (Endocrinology) is a rapid-revision guide designed to maximise scoring in MRCP Part 1. It focuses on the most tested endocrine domains—thyroid, adrenal, pituitary, calcium–bone, and diabetes—using concise facts, exam traps, and a practical case. Revise patterns, not isolated values, and reinforce learning with MCQs and mock exams.


Why this matters

Endocrinology consistently contributes a reliable number of questions in MRCP Part 1, but these are often deceptively tricky. Candidates lose marks not due to lack of knowledge, but due to confusion over lab patterns, dynamic testing, and drug effects. A structured, high-yield approach ensures efficient recall under exam pressure.

For a broader roadmap, see the MRCP Part 1 overview, then test yourself using Free MRCP MCQs and consolidate with a Start a mock test.


Core sections

The 5 most tested subtopics

  1. Thyroid disorders

  2. Adrenal diseases

  3. Pituitary and hypothalamic disorders

  4. Calcium and bone metabolism

  5. Diabetes mellitus and metabolic syndromes

50 High-Yield Facts (rapid revision)

Thyroid (1–10)

  1. TSH is the best initial screening test for thyroid dysfunction.

  2. Subclinical hypothyroidism: ↑TSH, normal FT4.

  3. Graves’ disease: TSH receptor antibodies + ophthalmopathy.

  4. Thyroid storm is a medical emergency—treat with beta-blocker + carbimazole + iodine.

  5. Hashimoto thyroiditis increases lymphoma risk.

  6. De Quervain thyroiditis causes painful thyroid and transient thyrotoxicosis.

  7. Amiodarone can cause both hypo- and hyperthyroidism.

  8. Lithium commonly causes hypothyroidism.

  9. Sick euthyroid syndrome occurs in acute illness.

  10. Radioiodine is contraindicated in pregnancy.

Adrenal (11–20)

  1. Addison disease: hyponatraemia, hyperkalaemia, hypotension.

  2. Hyperpigmentation due to ↑ACTH.

  3. Synacthen test diagnoses adrenal insufficiency.

  4. Cushing syndrome: screen with dexamethasone suppression test.

  5. Ectopic ACTH does not suppress with high-dose dexamethasone.

  6. Phaeochromocytoma: headache, sweating, palpitations.

  7. Plasma metanephrines are diagnostic.

  8. Always start alpha-blockade before beta-blockade.

  9. Conn syndrome: hypertension + hypokalaemia.

  10. Long-term steroids require tapering.

Pituitary (21–30)

  1. Prolactinoma is the most common pituitary tumour.

  2. Hyperprolactinaemia causes hypogonadism.

  3. Treat prolactinoma with dopamine agonists.

  4. IGF-1 is the best screening test for acromegaly.

  5. OGTT confirms acromegaly (failure to suppress GH).

  6. Diabetes insipidus causes dilute polyuria.

  7. SIADH causes euvolaemic hyponatraemia.

  8. Rapid sodium correction risks osmotic demyelination.

  9. Pituitary apoplexy is a medical emergency.

  10. Bitemporal hemianopia indicates optic chiasm compression.

Calcium & Bone (31–40)

  1. Primary hyperparathyroidism: ↑Ca, ↓PO₄, ↑PTH.

  2. Malignancy hypercalcaemia: ↑Ca, ↓PTH.

  3. Vitamin D deficiency: ↓Ca, ↓PO₄, ↑ALP.

  4. Osteoporosis: DEXA T-score ≤ −2.5.

  5. Bisphosphonates are first-line therapy.

  6. Paget disease: isolated ↑ALP.

  7. CKD causes secondary hyperparathyroidism.

  8. Hypocalcaemia causes tetany.

  9. Chvostek and Trousseau signs indicate hypocalcaemia.

  10. Severe hypercalcaemia requires IV fluids.

Diabetes (41–50)

  1. DKA: metabolic acidosis + ketonaemia.

  2. HHS: severe hyperglycaemia without ketosis.

  3. Metformin is first-line in T2DM.

  4. Insulin shifts potassium intracellularly.

  5. HbA1c reflects 3-month glycaemic control.

  6. GLP-1 agonists promote weight loss.

  7. SGLT2 inhibitors may cause euglycaemic DKA.

  8. Microalbuminuria indicates early nephropathy.

  9. Autonomic neuropathy causes resting tachycardia.

  10. Tight control reduces microvascular complications.


Summary Table

Topic

Key Test

Classic Finding

First-line Treatment

Thyroid

TSH

Graves: eye signs

Carbimazole

Adrenal

Synacthen

Addison: ↑K⁺

Hydrocortisone

Pituitary

IGF-1

Acromegaly

Surgery

Calcium

PTH

↑Ca, ↓PO₄

Surgery

Diabetes

HbA1c

≥48 mmol/mol

Metformin

Medical student studying endocrinology notes for MRCP Part 1 exam preparation

Practical examples / mini-cases

Case: A 45-year-old man presents with central obesity, purple striae, and hypertension. Cortisol remains elevated after dexamethasone suppression.

Answer: Cushing syndrome. Explanation: Failure to suppress cortisol confirms hypercortisolism. Next step is to determine ACTH dependency.


Common pitfalls (5 bullets)

  • Misinterpreting sick euthyroid syndrome

  • Forgetting drug-induced endocrine disorders

  • Incorrect sequence in phaeochromocytoma management

  • Overcorrecting hyponatraemia

  • Ignoring potassium changes in DKA


Practical study-tip checklist

  • Revise lab patterns, not isolated values

  • Memorise key diagnostic tests

  • Practise daily using Free MRCP MCQs

  • Attempt weekly mock tests

  • Link endocrine with renal and metabolic topics

For structured preparation, follow a Study plan for MRCP Part 1.


FAQs

1. What endocrine topics are most important for MRCP Part 1?

Thyroid, adrenal, diabetes, pituitary, and calcium metabolism are the most frequently tested.

2. How can I remember endocrine lab patterns?

Focus on triads (e.g., Ca–PTH–PO₄) and practise MCQs regularly.

3. Are dynamic endocrine tests important?

Yes—Synacthen, dexamethasone suppression, and OGTT are commonly tested.

4. What is the best revision strategy?

Use high-yield notes + MCQs + mock exams for reinforcement.

5. How many endocrine questions appear in MRCP Part 1?

Typically a moderate number, but they are highly scoring if prepared well.


Ready to start?

Revise these 50 facts systematically, then test your understanding with Free MRCP MCQs and simulate exam conditions using a mock test. Strengthen weak areas through the MRCP Part 1 overview pathway.


Sources

 
 
 

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