Measure blood oxygen levels as you sleep.
Part of an initial screening for obstructive sleep apnea (OSA).
What is a Nocturnal Oximetry Test?
Nocturnal oximetry is a test to monitor and record the level of oxygen in your blood as you sleep through the night. This test is normally done at home. With this test, an oxygen sensor is placed on your finger and connected to a machine called an oximeter. The oximeter measures and records your heart rate and the level of oxygen carried in your blood.

Why do I need it?
There are several reasons that your healthcare provider may recommend overnight home oximetry. Common reasons include:
  • As part of an initial screening for obstructive sleep apnea (OSA). OSA is a condition in which you briefly stop or reduce your breathing while you sleep. When this happens, the level of oxygen in your blood may drop, which will be measured and recorded on the oximeter.
  • Overnight pulse oximetry monitoring is a cost effective and minimally invasive method for the dentist to adjust your dental device prior to a follow-up home sleep test (HST) or facility-based polysomnography (PSG). While at least one follow-up HST or PSG is usually required, using oximetry reduces the likelihood that you'll need to return for additional HSTs or PSGs.
  • To assess the need to start, continue, or increase home oxygen for various conditions.
What happens before the test?
Getting the equipment.
  • A wrist-worn oximeter that clips on your finger (this is the machine that records your blood oxygen levels and heart rate).

  • Testing instructions.
Preparing the day of the test.
• If you take medications or consume alcohol and/or caffeine on the day(s) of your test, write down the times and amounts taken.
Talking with your healthcare
providers about home oximetry
Return the equipment and follow-up with your healthcare provider as advised to get the results and discuss next steps. You may need to have additional sleep testing to confirm a diagnosis of sleep apnea and evaluate treatment.

The table below lists common potential benefits, risks, and alternatives for home oximetry. Other benefits and risks may apply in your unique medical situation. Talking with your healthcare providers is the most important part of learning about the risks and benefits. If you have questions, be sure to ask.

Can be a first step in screening for OSA.

Offers the convenience of being at home.

It provides your clinician with objective data which they can use when determining the best treatment settings.
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