Diagnosis of Frostbite
Diagnosis of Frostbite The diagnosis of frostbite is made based on physical examination. Examination of the history of cold exposure and the severity of tissue damage. Frostbite is usually diagnosed clinically, but in more advanced cases, imaging and other tests may be required to determine the depth of the injury and guide treatment. Clinical Evaluation A doctor will assess: Appearance of the affected area – skin colour, texture, swelling, and presence of blisters Sensation and movement – to check for numbness or nerve damage History of exposure – including temperature, wind chill, and duration of cold contact Symptoms after rewarming – such as pain, return of sensation, and skin changes Experts typically grade the severity of frostbite into four degrees: First-degree – superficial, with no blisters Second-degree – clear blisters and swelling Third-degree – blood-filled blisters and deeper tissue involvement Fourth-degree – full-thickness damage to muscle, tendons, or bone Imaging Tests In moderate to severe cases, doctors may request: Doppler ultrasound – to assess blood flow in the affected tissues Bone scans – to determine the extent of deeper tissue or bone involvement MRI or Technetium-99 scans – helpful in planning surgery or amputation when necessary Use these tools several days after rewarming to assess tissue viability. Laboratory Tests Perform blood tests to: Check for infection, especially if blisters have ruptured Monitor electrolyte levels and general health in severe or systemic frostbite Screen for rhabdomyolysis if muscle damage seems likely Distinguishing from Other Conditions In rare cases, frostbite may be mistaken for: Chilblains (pernio) – inflammatory lesions from non-freezing cold exposure Raynaud’s phenomenon – temporary narrowing of blood vessels causing colour change Trench foot – due to prolonged damp exposure, not freezing Diagnosis of Frostbite Accurate diagnosis of frostbite ensures appropriate treatment and helps predict recovery or risk of complications such as amputation or nerve damage. [Next: Treatment of Frostbite →]









