Airway Resistance (Raw) normal range is?

Airway Resistance (Raw) normal range is?

• A. 0.06-0.24 cm H2O/L/sec
• B. 60-240 cm H2O/L/sec
• C. 6-24 cm H2O/L/sec
• D. 0.6-2.4 cm H2O/L/sec

Answer: (C)

Airway resistance is a measure of how hard the airways must be pressured to move a given amount of air; it is calculated as the pressure difference driving flow divided by the flow, in the units cm H2O per L/sec. In healthy adults at rest, the normal range is about 0.6–2.4 cm H2O/L/sec. This relatively low value reflects open, unobstructed airways. When the airways narrow due to bronchospasm, inflammation, or mucus, Raw increases because more pressure is needed to push the same flow. So a higher Raw indicates increased airway resistance, typical of obstructive conditions, while normal Raw sits around 0.6–2.4.

Airway resistance is a measure of how hard the airways must be pressured to move a given amount of air; it is calculated as the pressure difference driving flow divided by the flow, in the units cm H2O per L/sec. In healthy adults at rest, the normal range is about 0.6–2.4 cm H2O/L/sec. This relatively low value reflects open, unobstructed airways. When the airways narrow due to bronchospasm, inflammation, or mucus, Raw increases because more pressure is needed to push the same flow. So a higher Raw indicates increased airway resistance, typical of obstructive conditions, while normal Raw sits around 0.6–2.4.