What physical examination finding is indicative of a urethral meatus injury?

Blood at the urethral meatus is a critical finding when assessing a potential urethral injury. This sign is particularly important as it indicates possible trauma to the urethra, which can occur in various scenarios such as pelvic fractures or penetrating injuries.

In accordance with established medical guidelines, the presence of blood at the meatus should prompt further evaluation to rule out significant injury. This might include imaging studies such as a retrograde urethrogram before any attempts at urethral catheterization, to prevent exacerbating any existing injury.

The other options do not specifically relate to urethral meatus injuries. Prostate enlargement can indicate other urological issues but does not directly suggest a urethral injury. Abdominal tenderness could be associated with various abdominal or pelvic conditions and is not specific to urethral injury. Fever might indicate an infectious process or systemic response but is not a direct indicator of urethral trauma. Therefore, the presence of blood at the urethral meatus stands out as the most significant finding in this context.