What is the normal respiration rate for adults?

• A. 12-20 breaths per minute
• B. 8-12 breaths per minute
• C. 20-30 breaths per minute
• D. 30-40 breaths per minute

Answer: (A)

Normal respiration rate for an adult at rest is typically 12 to 20 breaths per minute. This range reflects the usual ventilatory effort needed to meet the body's oxygen demands and remove CO2 while the person is calm. Rates within this window are considered normal and stable. A rate that's lower, around 8 to 12, is bradypnea and can occur with deep sleep, athletic conditioning, or certain medical conditions. A rate of 20 to 30 is tachypnea, seen with fever, anxiety, infection, or respiratory distress. Rates above 30 are clearly abnormal and indicate significant distress or metabolic issues. So the 12–20 breaths per minute range best represents the normal resting rate for adults. To measure accurately, count breaths for a full minute.