Oximetry

What is Oximetry?

A pulse oximeter is a small medical device that is put on the tip of the finger, to check someone’s oxygen levels.

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Oximetry

Oximetry is a way to measure the amount of oxygen in the blood. It is measured using infra-red light and is completely painless.

Having this test done will allow the doctors to ascertain whether or not you are having problems with your breathing when you are asleep.

However, if this test is inconclusive you may be invited to come for a further test called a sleep study.

Oximetry is very safe.

Possible minor effects:

  • Temporary skin indentation or mild irritation from the probe

  • A small sensor is placed on your finger.
  • Light wavelengths pass through the tissue to estimate your oxygen saturation (SpO₂) and pulse rate.
  • Readings are taken within a few seconds.

  • Simple and painless: Oximetry is quick, non-invasive, and does not involve needles or breathing into equipment.
  • Movement matters: Keeping your hand still helps ensure an accurate reading.
  • Cold hands or nail products: Cold fingers, dark nail polish, or artificial nails can sometimes affect results—let staff know if this applies to you.
  • Temporary reading: Oximetry shows your oxygen level at that moment in time and does not explain the cause of low or high readings.
  • Interpretation: Results are reviewed alongside your symptoms and other tests, not on their own.
  • Reusable or disposable probes: Sensors are cleaned or single-use to maintain hygiene and safety.

How to use our services

You can be seen through the NHS or as a private patient. You’ll need a referral first, and we’ll check it to make sure this service is right for you.

NHS Referral Going Private

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