![]() Deoxygenated and oxygenated hemoglobin absorb light at different wavelengths (660 nm and 940 nm respectively), and the absorbed light is processed by a proprietary algorithm in the pulse oximeter to display a saturation value. For example, if you’re admitted to hospital with a flare-up of COPD symptoms, you won’t have a blood sample taken from your earlobe.Pulse oximetry is a non-invasive monitor that measures the oxygen saturation in the blood by shining light at specific wavelengths through tissue (most commonly the fingernail bed). The earlobe method normally can’t be used if you need to have the test when you are unwell. This isn’t painful - it’s similar to the way blood sugar levels can be checked from a pinprick on the fingertip. After a few minutes your doctor can take a sample by pricking the earlobe and catching the blood droplet.The blood vessels in your ear lobe will then contain about the same amount of oxygen as blood taken from your wrist.Your doctor will put a cream on your earlobe that helps increase blood flow.Some hospitals check blood gas by taking a blood sample from your earlobe. Sometimes, they will use local anaesthetic so that you won’t feel the needle. The test can be a little uncomfortable but the doctor will do their best to reduce this. They will normally take this by using a needle and a syringe in your wrist. ![]() Your doctor will take a small sample of your blood.
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