Rectal examination (OSCE)

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🩺 Digital rectal examination (DRE) is a core clinical skill in OSCEs and real practice. It is often examined on manikins rather than real patients, but you must still treat it with full professionalism - consent, chaperone, dignity, and clear communication are heavily marked. Key principle: This is an invasive exam - verbalise every step, reassure the patient continuously, and document chaperone offer. Time goal: 4–6 minutes. Verbalise aloud (gains marks even if you miss something).

🔑 Step-by-Step Rectal Examination Sequence (High-Yield OSCE Flow)

1. 🧼 Preparation & Introduction (45–60 s)
   • Wash hands, introduce yourself, confirm name/DOB/hospital number.
   • Explain sensitively: “I need to examine your back passage to check for any problems. This involves a gloved finger inside the rectum. It may feel uncomfortable or like you need to pass wind, but it should not be painful. It takes less than a minute. You can stop me at any time.”
   • Mandatory: Offer a chaperone (even on manikin) - say “I will ask a chaperone to be present for this intimate examination.” Document offer even if declined.
   • Gain explicit verbal consent: “Are you happy for me to proceed?”
   • Equipment: non-latex gloves, water-soluble lubricant, tissues, apron, light source, clinical waste bin.
   • Position: left lateral (Sims’ position) - knees flexed to chest, back straight, sheet for dignity.
   • Verbalise: “I’m positioning the patient in the left lateral position with knees drawn up for optimal access and comfort.”
2. 👀 Inspection of Perianal Area (30–45 s)
   • Part buttocks gently, inspect skin and anus:
     • External haemorrhoids (swollen, bluish, thrombosed if purple/hard).
     • Skin tags (sentinel pile in chronic fissure).
     • Anal fissure (linear tear, usually posterior midline, very tender).
     • Fistula-in-ano (external opening, discharge, granulation).
     • Perianal abscess (swelling, erythema, fluctuance).
     • Warts (HPV), ulcers (herpes, Crohn’s), bleeding, soiling, excoriation (pruritus ani).
     • Scars (previous surgery, episiotomy), prolapsed mucosa/rectum.
   • Verbalise: “On inspection, I note no external haemorrhoids, fissures, fistulae, or skin tags. The perianal skin appears normal with no visible blood or discharge.”
3. ✋ Digital Rectal Examination (1.5–3 min)
   • Glove and lubricate index finger generously.
   • Warn: “I’m now going to place a lubricated finger against the anus. Take a deep breath in, then breathe out slowly - this relaxes the sphincter.”
   • Gently press pad of finger on anal verge → wait for relaxation → advance slowly on expiration (never force).
   • Anal canal & sphincter tone:
     • Resting tone (normal = snug grip).
     • Voluntary squeeze (ask patient to “squeeze my finger as if holding in wind” - assess strength, symmetry).
     • Reduced tone → neurogenic (MS, cauda equina, obstetric injury), post-surgical.
     • Increased/spastic tone → anal fissure, proctalgia fugax.
   • Rectal contents & wall:
     • Sweep 360° clockwise/counterclockwise.
     • Assess: hard stool/faecal impaction, masses (polyp, tumour – hard, irregular, fixed), tenderness (prostatitis, abscess), blood/mucus/pus on glove.
     • Melaena (black tarry), fresh blood (haemorrhoids, fissure, cancer).
   • Males – Prostate Examination:
     • Feel anterior rectal wall (posterior prostate surface).
     • Normal: smooth, rubbery, walnut-sized (~3–4 cm), midline sulcus palpable, non-tender.
     • Benign prostatic hyperplasia (BPH): enlarged, smooth, rubbery, sulcus preserved.
     • Prostate cancer: hard, nodular, irregular, sulcus obliterated, asymmetry, fixed.
     • Prostatitis: boggy, very tender, warm.
   • Females: Anterior wall may allow palpation of cervix/uterus if low-lying.
   • Verbalise throughout: “I’m now assessing anal tone… there is good resting and squeeze tone… sweeping the rectal wall… no masses or tenderness palpable… prostate feels smooth, non-tender, approximately 3 cm with preserved sulcus.”
4. 🧤 Glove & Perianal Check on Withdrawal (15 s)
   • Inspect glove: blood (fresh red, melaena), mucus, pus, stool colour/consistency.
   • Re-inspect perianal area on withdrawal for missed lesions.
   • Verbalise: “On the glove, there is no blood, mucus, or pus. The perianal area remains normal.”
5. 🙏 Closure & Completion (30–45 s)
   • Dispose of glove safely, offer tissues/wipes, help patient redress.
   • Thank patient: “Thank you for your cooperation. The examination is complete.”
   • Wash hands.
   • Present findings clearly & succinctly: “On digital rectal examination, anal tone is normal, no masses or tenderness palpable, prostate is smooth, non-tender, and of normal size with a preserved central sulcus. No blood on the glove.”
   • State: “To complete my examination, I would like to perform an abdominal examination, check external genitalia and hernial orifices, dip urine for blood/protein, perform a faecal occult blood test, and arrange blood tests (FBC, U&E, PSA if prostate concern, LFTs), abdominal ultrasound, and flexible sigmoidoscopy/colonoscopy as indicated.”

📊 High-Yield Rectal & Prostate Findings Table (OSCE Master Reference)

🚩 Red Flags & Do-Not-Miss OSCE Points

• Hard, irregular, fixed rectal mass → rectal cancer → urgent referral.
• Virchow’s node + rectal mass → gastric cancer metastasis (Troisier’s sign).
• Blood on glove + weight loss + change in bowel habit → colorectal cancer.
• Decreased tone + saddle anaesthesia + urinary retention → cauda equina syndrome (emergency MRI).
• Acute prostatitis + fever + severe tenderness → urology admission, antibiotics.

💡 OSCE Examiner & Candidate Pearls

• Chaperone is mandatory - always offer and document (even on manikin).
• Never force - if patient cannot tolerate, stop and state “I would defer the exam and refer to a senior colleague.”
• Verbalise reassurance throughout: “Take a deep breath in… now breathe out slowly… relax your bottom.”
• Glove check is high-yield - always comment on blood/mucus/pus/melaena.
• Prostate description: “smooth, rubbery, walnut-sized, preserved sulcus, non-tender” vs “hard, irregular, nodular, sulcus obliterated”.
• Finish strong: “To complete, I would perform an abdominal examination, check external genitalia and hernial orifices, dip urine for blood/protein, perform faecal occult blood test, and arrange flexible sigmoidoscopy/colonoscopy, PSA, and abdominal imaging as indicated.”
• Common fail points: no chaperone offer, poor explanation, rushing, not inspecting perianal area, forgetting glove check, inadequate verbalisation.

📚 References & Resources (Feb 2026)

• Talley & O’Connor – Clinical Examination (9th ed., 2025 update).
• Geeky Medics Digital Rectal Examination OSCE Guide (2026 revision).
• OSCEstop & PassMedicine GI/rectal sections.
• NICE Guidelines: Suspected Colorectal Cancer (2025).
• BAUS Prostate Cancer Guidelines (2025 update).