A 35-year-old man is brought to the emergency department with thermal burns sustained 6 hours ago. On examination, the burnt area shows erythema, blistering, and severe pain on touch. The skin blanches on pressure but returns to normal colour slowly. Which investigation is most appropriate to confirm the depth of burn and guide further management?

Explanation

## Assessment of Burn Depth: Clinical Assessment as the Gold Standard ### Clinical Context The patient presents with erythema, blistering, severe pain on touch, and slow capillary refill — classic features of a **superficial partial-thickness (2nd degree) burn**. In standard clinical practice, burn depth is primarily determined by **clinical assessment** based on appearance, pain sensation, and capillary refill. ### Why Clinical Assessment is the Correct Answer **Key Point:** According to standard burn management guidelines (as referenced in Bailey & Love's Short Practice of Surgery and WHO Burn Care guidelines), **clinical assessment alone** — evaluating wound appearance, blister characteristics, pain response, and capillary refill — is the gold standard for initial burn depth determination in acute settings. ### Burn Depth Classification by Clinical Features | Burn Degree | Appearance | Pain | Blanching | Management | | --- | --- | --- | --- | --- | | **Superficial (1st)** | Erythema, no blisters | Painful | Yes, brisk | Conservative | | **Superficial partial-thickness (2nd)** | Blisters, moist, pink | Very painful | Yes, slow | Conservative/dressings | | **Deep partial-thickness (2nd)** | Pale/mottled, dry | Reduced pain | Sluggish/absent | May need grafting | | **Full-thickness (3rd)** | Leathery, white/charred | Painless | Absent | Grafting required | **Clinical Pearl:** In this case — erythema, blistering, severe pain, and slow blanching — the clinical picture is diagnostic of a **superficial partial-thickness burn**. No additional investigation is required to confirm depth in routine acute management. ### Why Other Options Are Incorrect - **Option A (Ultrasound):** Not a validated or routinely used modality for burn depth assessment in clinical practice. - **Option B (Histopathology):** While histopathology is the anatomical gold standard, it is **not used in routine acute burn management**. It is reserved for medicolegal/forensic cases or research. Performing a biopsy on an acute burn wound is impractical and potentially harmful. - **Option D (Thermography):** Thermography can assess tissue perfusion but is not standard practice for initial burn depth assessment; it is an investigational tool. **High-Yield:** For NEET PG/INI-CET, remember that **clinical assessment** (appearance + pain + capillary refill) is the primary and most appropriate method for burn depth determination in acute settings. Histopathology is a medicolegal/forensic tool, not a routine clinical investigation for burns. *Reference: Bailey & Love's Short Practice of Surgery, 27th edition; WHO Guidelines for Burn Care.*