Your doctor may measure your oxygen level in different circumstances: while sitting at rest, while walking in the hallway or on a treadmill, and during sleep. If your oxygen level drops below about 88%, your doctor may prescribe oxygen therapy. Your oxygen prescription will include: 🔹 When to use your oxygen (during sleep, rest, or activity, or at altitude) 🔹 How much oxygen you need for each activity 🔹 What type of oxygen equipment fits your lifestyle and oxygen requirements Using oxygen can