Royal College of Veterinary Surgeons Membership Exam (RCVS) Diagnostic and Foundational Veterinary Sciences Syllabus

Diagnostic and Foundational Veterinary Sciences syllabus — full chapter and topic list

Expand any chapter to see its topics and sub-topics. This is the whole examinable outline for Diagnostic and Foundational Veterinary Sciences in Royal College of Veterinary Surgeons Membership Exam (RCVS), not a summary of it.

1. 1

   Clinical Pathology and Laboratory Diagnostics

   4 topics

   • Haematology and blood biochemistry
     • Interpretation of the complete blood count
     • Organ-specific biochemistry panels
   • Cytology and histopathology
     • Sample collection and fine needle aspiration
     • Interpretation principles and submission
   • Microbiology and culture
     • Bacterial culture and sensitivity testing
     • Sample handling and interpretation
   • Urinalysis and body fluid analysis
2. 2

   Diagnostic Imaging

   3 topics

   • Radiography
     • Radiographic principles, positioning and safety
     • Interpretation of thoracic and abdominal radiographs
     • Ionising radiation regulations and protection
   • Ultrasonography
     • Abdominal ultrasound principles
     • Echocardiography basics
   • Advanced imaging
     • Indications for CT and MRI
     • Endoscopy applications
3. 3

   Pharmacology and Therapeutics

   4 topics

   • Principles of pharmacology
     • Pharmacokinetics and pharmacodynamics
     • Dose calculation and routes of administration
   • Antimicrobial therapy
     • Rational antimicrobial selection
     • Antimicrobial resistance and stewardship
   • Analgesics and anti-inflammatories
     • NSAIDs and opioids
     • Corticosteroid use and risks
   • Toxicology and adverse drug reactions
     • Common poisonings and antidotes
     • Pharmacovigilance and reporting
4. 4

   Applied Anatomy, Physiology and Nutrition

   4 topics

   • Comparative clinical anatomy
     • Surface anatomy and surgical landmarks
     • Species-specific anatomical differences
   • Applied physiology
     • Cardiovascular and respiratory physiology
     • Acid-base and electrolyte balance
   • Clinical nutrition
     • Nutritional assessment and life-stage feeding
     • Therapeutic and assisted nutrition
   • Evidence-based veterinary medicine

Diagnostic and Foundational Veterinary Sciences flashcards for Royal College of Veterinary Surgeons Membership Exam (RCVS)

21 of 52 cards from the Diagnostic and Foundational Veterinary Sciences deck — real questions with worked answers.

1. What is the formula for calculating Mean Corpuscular Volume (MCV) and its units?

   $MCV = \frac{PCV(\%) \times 10}{RBC\ (\times 10^{12}/L)}$, expressed in femtolitres (fL). It reflects average red cell size and classifies anaemia as microcytic, normocytic or macrocytic.

2. How is Mean Corpuscular Haemoglobin Concentration (MCHC) calculated, and what does a high value usually indicate?

   $MCHC = \frac{Hb\ (g/dL) \times 100}{PCV\ (\%)}$, in g/dL. A spuriously high MCHC usually indicates haemolysis, lipaemia or Heinz bodies rather than a true increase, since cells cannot be supersaturated with haemoglobin.

3. In a haemogram, what does a left shift indicate and how is a regenerative versus degenerative left shift distinguished?

   A left shift is the presence of immature neutrophils (bands). Regenerative: mature neutrophils exceed immature ones with neutrophilia (good marrow response). Degenerative: immature neutrophils exceed mature ones, often with normal/low total count, indicating overwhelming demand and a poorer prognosis.

4. Which serum enzymes are most liver-specific (hepatocellular) versus cholestatic in the dog?

   Hepatocellular leakage enzymes: ALT and AST (ALT more liver-specific in dogs/cats). Cholestatic/biliary enzymes: ALP and GGT. In cats, ALP has a short half-life and no steroid isoenzyme, so even mild ALP elevation is significant; GGT helps confirm cholestasis.

5. What is the corrected calcium formula used in dogs and why is it applied?

   $Ca_{corrected}\ (mg/dL) = Ca_{measured} - albumin\ (g/dL) + 3.5$. Because roughly half of serum calcium is albumin-bound, hypoalbuminaemia lowers total calcium; the correction estimates the physiologically active fraction (though ionised calcium measurement is preferred).

6. What does an elevated anion gap indicate, and how is it calculated?

   $Anion\ gap = (Na^{+} + K^{+}) - (Cl^{-} + HCO_3^{-})$. An increased anion gap indicates accumulation of unmeasured anions, e.g. lactic acidosis, ketoacidosis, uraemia or ethylene glycol toxicity.

7. On cytology, what defines a transudate, modified transudate and exudate by total protein and nucleated cell count?

   Transudate: protein $<25$ g/L and nucleated cells $<1.5\times10^{9}/L$. Modified transudate: protein 25–35 g/L, cells $1.5$–$5\times10^{9}/L$. Exudate: protein $>30$ g/L and cells $>5\times10^{9}/L$ (often $>7\times10^{9}/L$), reflecting increased vascular permeability or inflammation.

8. List the cytological criteria of malignancy (features of nuclear and cellular atypia).

   Anisocytosis and anisokaryosis, high and variable nuclear-to-cytoplasmic ratio, prominent/multiple/angular nucleoli, coarse chromatin, multinucleation with nuclear moulding, abnormal mitotic figures, and a high nuclear-to-cytoplasmic ratio. Three or more criteria affecting the nucleus strongly suggest malignancy.

9. What is the difference between fine-needle aspiration cytology and histopathology in terms of architecture and grading?

   Cytology assesses individual cell morphology from aspirated cells; it is rapid and minimally invasive but cannot evaluate tissue architecture, invasion or reliable tumour grade. Histopathology preserves tissue architecture, allowing assessment of invasion, margins and definitive grading/staging.

10. In histopathology, what is the purpose of immunohistochemistry (IHC) and give a common marker example.

    IHC uses labelled antibodies to detect specific cellular antigens, helping classify poorly differentiated tumours and determine origin/lineage. Example: CD3 marks T lymphocytes and CD79a/CD20 mark B lymphocytes to immunophenotype lymphoma; cytokeratin identifies epithelial (carcinoma) origin and vimentin mesenchymal origin.

11. What does a Gram stain distinguish, and what colour are Gram-positive versus Gram-negative bacteria?

    Gram stain distinguishes bacteria by cell wall structure. Gram-positive bacteria have a thick peptidoglycan layer and stain purple/blue (retain crystal violet). Gram-negative bacteria have a thin peptidoglycan layer with an outer membrane and stain pink/red (counterstained with safranin).

12. Define minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC).

    MIC is the lowest antimicrobial concentration that visibly inhibits bacterial growth in vitro. MBC is the lowest concentration that kills $\geq 99.9\%$ of the inoculum. A drug is generally considered bactericidal when $MBC/MIC \leq 4$.

13. What is the difference between concentration-dependent and time-dependent antimicrobial killing, with a drug class example of each?

    Concentration-dependent killing increases with higher peak concentration; efficacy correlates with $C_{max}/MIC$ or $AUC/MIC$ (e.g. aminoglycosides, fluoroquinolones). Time-dependent killing depends on the duration the concentration exceeds MIC ($T>MIC$) (e.g. beta-lactams: penicillins, cephalosporins).

14. On urinalysis, what is the formula relationship for urine specific gravity interpretation, and what USG defines adequate concentrating ability in a dog and cat?

    USG estimates urine solute concentration relative to water (1.000). Adequate concentration: dog $>1.030$, cat $>1.035$. Isosthenuria is USG 1.008–1.012 (equal to plasma), and hyposthenuria is $<1.008$. Azotaemia with USG in the isosthenuric range suggests renal failure.

15. What is the urine protein-to-creatinine ratio (UPC), and what value indicates significant proteinuria in the dog?

    $UPC = \frac{urine\ protein\ (mg/dL)}{urine\ creatinine\ (mg/dL)}$. It quantifies proteinuria independent of urine concentration. UPC $<0.2$ is normal in dogs, 0.2–0.5 is borderline, and $>0.5$ (dog) / $>0.4$ (cat) indicates significant renal proteinuria once pre/post-renal causes are excluded.

16. Name and describe the common urinary crystals associated with ethylene glycol toxicity and with urinary alkalinisation.

    Ethylene glycol toxicity produces calcium oxalate monohydrate crystals (picket-fence/dumbbell shaped). Alkaline urine favours struvite (magnesium ammonium phosphate, coffin-lid shaped) and amorphous phosphate crystals. Calcium oxalate dihydrate forms classic envelope shapes.

17. In synovial (joint) fluid analysis, how do degenerative joint disease and immune-mediated polyarthritis differ in cell counts?

    Degenerative joint disease: low total nucleated cell count (typically $<3\times10^{9}/L$) with predominantly mononuclear cells and good viscosity. Immune-mediated/septic polyarthritis: markedly increased cell count with predominance of non-degenerate (immune) or degenerate (septic) neutrophils and reduced viscosity.

18. State the relationship between radiographic exposure factors kVp and mAs and image quality.

    kVp controls the energy/penetrating power of the X-ray beam and thus radiographic contrast (higher kVp = lower contrast, longer grey scale). mAs (milliampere-seconds) controls the quantity of photons and thus radiographic density/blackening. Doubling distance reduces intensity by the inverse square law: $I \propto \frac{1}{d^{2}}$.

19. List the five basic radiographic opacities from least to most radiopaque.

    From least to most radiopaque (lucent to dense): gas/air, fat, soft tissue/fluid, bone/mineral, and metal. Soft tissue and fluid have the same opacity, which is why fluid-filled and soft tissue structures cannot be distinguished by radiography alone.

20. What causes a radiographic 'border effacement' (silhouette) sign and what does it tell you?

    Border effacement occurs when two structures of the same opacity (e.g. soft tissue/fluid) are in direct contact, so their margins merge and become indistinguishable. It localises a lesion by indicating the abnormal tissue is in the same opacity and in contact with the silhouetted structure.

21. Explain the piezoelectric principle underlying diagnostic ultrasound.

    Ultrasound transducers contain piezoelectric crystals that convert electrical energy into high-frequency sound waves and convert returning echoes back into electrical signals. Image formation relies on the time delay and amplitude of reflected echoes at tissue interfaces of differing acoustic impedance.

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