Pulse Oximetry Screening: About Your Child's Test

What is it?

Pulse oximetry (or pulse ox) is one of the routine screening tests that your baby may get. It measures oxygen levels in the blood with a small device wrapped around the hand and foot. It's done to check for serious heart problems (congenital heart disease). Experts recommend it for most babies.

Why is it done?

The pulse oximetry screening test checks for heart problems that lower the oxygen levels in your baby's blood. If a baby is born with a heart problem, it's best if doctors know about it right away. That's why most babies get this test soon after birth.

How do you prepare for the test?

In general, there's nothing you have to do before this test, unless your doctor tells you to.

How is the test done?

A small, soft sensor will be wrapped around your baby's hand and foot. It's connected to a machine. The machine reads oxygen levels in the blood. Nursery staff will do the test and record the results. You can stay with your baby. If you have questions, ask the staff or doctor.

How long does the test take?

The test takes just a few minutes. If the results show that there might be a problem, the nursery staff may do the test again a little later.

What happens after the test?

• If test results are in the normal range, then nothing else needs to happen.
• If test results aren't in the normal range, your baby may be tested again.
• If the results still show a possible problem, the doctor will talk to you about other tests to check your baby's heart and breathing.