When preparing for a physical therapy session using supplemental oxygen, you must subtract how many psi from the tank gauge to estimate the remaining pressure?

When preparing for a physical therapy session using supplemental oxygen, you must subtract how many psi from the tank gauge to estimate the remaining pressure?

• A. 100 psi
• B. 200 psi
• C. 150 psi
• D. 250 psi

Answer: (B)

In oxygen cylinder management for therapy, you use a fixed cushion on the gauge to ensure you don’t run out mid-session. Subtracting a small, standard amount from the gauge helps you estimate how much usable gas remains before you need to replace or refill. The common rule is to subtract 200 psi from the tank gauge reading to estimate the remaining pressure. This 200 psi cushion accounts for regulator and line losses and the fact that the very final portion of gas isn’t reliably deliverable, giving you a safe margin to plan the session and switch sources if needed. For a typical full cylinder, this leaves you with about 1800 psi of usable pressure to guide planning, though the exact usable volume also depends on cylinder size and flow rate. So, 200 psi is the standard subtraction used here.

In oxygen cylinder management for therapy, you use a fixed cushion on the gauge to ensure you don’t run out mid-session. Subtracting a small, standard amount from the gauge helps you estimate how much usable gas remains before you need to replace or refill. The common rule is to subtract 200 psi from the tank gauge reading to estimate the remaining pressure. This 200 psi cushion accounts for regulator and line losses and the fact that the very final portion of gas isn’t reliably deliverable, giving you a safe margin to plan the session and switch sources if needed. For a typical full cylinder, this leaves you with about 1800 psi of usable pressure to guide planning, though the exact usable volume also depends on cylinder size and flow rate. So, 200 psi is the standard subtraction used here.