Normal Respiratory Rate: Adult Values & Clinical Significance

Normal resting respiratory rate (RR) for adults: 12–15 breaths/minute.

Influencing Factors

• Age: Infants 30–60; children 20–30; elderly may be slightly higher.
• Fitness: Athletes 8–12 (efficient gas exchange).
• Altitude: ↑ RR (hypoxic drive).
• Temperature: Fever ↑ RR (~2–4 breaths/°C).
• Metabolic: Acidosis (Kussmaul), sepsis, DKA.
• Psychological: Anxiety, panic → hyperventilation.
• Medications: Opioids ↓ RR (respiratory depression); stimulants ↑.

Clinical Importance

• Vital sign; early marker of deterioration (sepsis, PE, cardiac, neuro).
• Count for full 60 seconds (not 15×4) – irregular patterns matter.
• Bradypnea (<10): Opioids, CNS depression, hypothyroidism.
• Tachypnea (>20): Pain, fever, acidosis, hypoxia, heart failure, PE, sepsis.

Always assess depth, pattern, effort, SpO₂, and context—not just rate.