What is NOT a sign of respiratory distress in a casualty?

Normal breathing rate is characterized by a breath frequency that falls within the expected range for an individual at rest, typically between 12 to 20 breaths per minute for adults. In the context of assessing respiratory distress, signs such as rapid, shallow breathing, stridor, and cyanosis indicate that the casualty is likely experiencing some form of respiratory compromise.

Rapid, shallow breathing may suggest that the body is attempting to compensate for inadequate oxygenation or increased carbon dioxide levels. Stridor is a high-pitched wheezing sound often indicative of a blockage in the upper airway, a significant sign of distress that requires immediate attention. Cyanosis, the bluish discoloration of the skin due to low oxygen levels, represents a critical condition that indicates severe respiratory issues.

Thus, a normal breathing rate signifies that there are no immediate concerns regarding the casualty's respiratory status, making it the correct choice for the question about what is not a sign of respiratory distress.