In order to measure your oxygen levels at rest, we need to take a small sample of blood from your earlobe, called a capillary blood gas. Firstly, your ear will be warmed up, using a heat rub cream.
Once warmed adequately, we will use a lancet (small needle) to produce blood flow from the earlobe. The resulting flow of blood can then be collected using a small tube called a capillary tube. As your earlobe is often less sensitive that other areas of the body, the test may feel a little uncomfortable, with minimal pain. Although this is unique to the patient. Please discuss with your Healthcare Professional if you have any concerns.
In some people oxygen levels can reduce during periods of activity. Therefore you may be asked to perform a walking test to assess whether you may benefit from oxygen during physical exertion. Your oxygen level during the walk test is monitored using a wrist oximeter.
For some conditions, oxygen levels can be lower during sleep. We may therefore issue you with a wrist oximeter to use overnight at home, to assess your oxygen levels at night.
You will also be asked a few questions about your symptoms and the activities you undertake. To carry out all of this can often take some time (sometimes up to an hour or more) and you may be asked to return for a second appointment in a few weeks’ time. This is important to allow us to discover the optimum oxygen level for you.