If you go to the doctor or if you have a condition affecting your lungs or heart, you may have your blood oxygen level checked. This number shows how much oxygen is in your blood and helps your care team see how well your lungs and heart are working.
How is Blood Oxygen Checked?
The easiest way to check blood oxygen is with a small clip called a pulse oximeter. It’s usually placed on your finger and gives a quick reading. Some people also have one at home to keep track of their oxygen levels.
Thanks to new technology, some smartwatches can check your oxygen levels too, making it easier than ever to track your breathing health.
What is a Normal Blood Oxygen Level?
Checking your blood oxygen level can help you know if your blood oxygen level is good or if it is too low. If your blood oxygen level is too low, your organs can be damaged, leading to organ failure or even death.
If your blood oxygen level is between 95-100%, it is normal. In certain cases, such as if you have a lung condition or if you live in an area of high elevation, a slightly lower percentage may be normal for you.
If your blood oxygen level is 92% or lower, you should contact your doctor.
If your blood oxygen level is 88% or lower, call 911 or go to your nearest Emergency Department. If you need to go to the hospital, you will likely receive a blood test called an arterial blood gas, which can make sure your blood oxygen level is accurate so you can get treatment as needed.
What Can Affect My Blood Oxygen Level Reading?
Sometimes your oxygen reading may not be exact. Things that can change the result include:
- Smoking
- Poor circulation
- Cold, clammy skin
- Dark nail polish or artificial nails
If you have darker or cold skin, or if you’re wearing dark nail polish or artificial nails, your pulse oximeter reading may not be exact. These factors can block the light the device uses. If your numbers seem abnormal, talk to your doctor to make sure nothing more serious is going on.
Are There Warning Signs of Low Blood Oxygen?
You might have low blood oxygen if you notice:
- A fast heartbeat, even when resting
- Chest tightness or pain
- Difficulty breathing
- Blue tint to your face, nails or lips
If these symptoms happen suddenly, call 911 right away.
Helping You Breathe Easier
UofL Health offers complete care for all lung and breathing problems, from asthma to COPD and everything in between.
If you need a lung specialist, call UofL Physicians – Pulmonary Associates in Shelbyville at 502-647-4154 or UofL Physicians – Pulmonology in Louisville at 502-588-4710 to schedule an appointment.
If you need a primary care provider, you can call UofL Physicians – Primary Care at 502-588-4343 to make an appointment.
In the event you or a loved one has symptoms of possible low blood oxygen, dial 911 or visit a UofL Health – Emergency Department.
