أي معلومة حديثة مهمة عن دقة جهاز قياس التشبع؟

Which recent finding about pulse oximeter accuracy is important?

1. It measures carbon dioxide accurately as well as oxygen
2. It is equally accurate in all clients and needs no cross-check
3. It may overestimate saturation in darker skin, masking hypoxaemia
4. It reads falsely low in carbon monoxide poisoning

Answer: C) It may overestimate saturation in darker skin, masking hypoxaemia. Recent studies show oximeters can overestimate saturation in people with darker skin, so clinical assessment and blood gases are used when in doubt. In carbon monoxide poisoning readings are falsely high.