I slept last night with the Oximeter, provided by Papworth Hospital, to measure the amount of saturated oxygen in the my lungs. Then off to the hospital for my quarterly lung test. The outcome showed a possible drop in the supine testing of my lung function but the respiratory tests remain stable. My average oxygen saturation this time with 94% which was an improvement on the last test at 92.5%. Overall therefore there was no significant respiratory symptoms that would require non-invasive ventilatory support although the doctor did say he suspected a marginal decline in my respiratory function.