If your doctor has advised the use of a pulse oximeter, you must have a million questions about the device and the process. Questions like, how to properly use the device, what to look out for and what is the normal pulse oximeter reading, are quite common.

So, what is the normal pulse oximeter reading? Typically, blood oxygen saturation level should be at least 89 percent. Most healthy people have a blood oxygen saturation level of 95 and 97 percent. Oxygen concentration level of 92 percent of below can indicate a potential for hypoxemia, an oxygen deficiency in the tissues. An abnormally fast pulse is called tachycardia. 'A pulse rate in the range of 100 to 120, may be normal after activity, but if your resting pulse is over 100, it could be a problem,' says Dr. 'Symptoms of an abnormal tachycardia include a pounding heart, chest pain and palpitations.

Feb 10, 2020 An abnormally fast pulse is called tachycardia. 'A pulse rate in the range of 100 to 120, may be normal after activity, but if your resting pulse is over 100, it could be a problem,' says Dr. 'Symptoms of an abnormal tachycardia include a pounding heart, chest pain and palpitations.

What is a Pulse Oximeter?

A pulse oximeter is a medical device used for pulse oximetry, a completely painless and non-invasive way to measure your blood oxygen saturation level. Measuring oxygen concentration means measuring the amount of oxygen in your blood.

The device is quite effective and pulse oximetry is an extremely simple and convenient way to monitor blood saturation. The device can accurately and instantly detect any changes in the oxygen concentration of your blood. It can accurately measure the amount of oxygen being carried to the farthest extremities of your body.

The pulse oximeter is surprisingly small. It is a clip-like device that you attach to your finger, ear lobe or toe. The device flashes light over the skin and analyzes the reflection of the light to determine the oxygen saturation levels.

The device does this by detecting changes in the reflection based on the color of the blood. Depending on the amount of oxygen in the blood, its color can change. Although the change in color is too subtle to be noticed by an untrained eye, the device’s microprocessor can instantly calculate the amount of oxygen in the blood.

Astonishingly, the device does this with surprising accuracy. A pulse oximeter can give accurate readings with a margin of error as small as two percent. The only way to get a more accurate measure of blood oxygen level is through a blood exam called arterial blood gas test.

Normal Pulse Level In Human Body

What is a Pulse Oximeter Used For?

The sole purpose of a pulse oximeter is to check how well is oxygen being carried by your blood to every part of the body.

The following are some of the conditions that may require the use of a pulse oximeter:

• Asthma
• Lung cancer
• Chronic Obstructive Pulmonary Disease
• Pneumonia
• Anemia
• Congenital Heart Defects
• Heart Attack
  

The following are some of the reasons for using a pulse oximeter:

• To assess the effectiveness of a lung medication.
• To determine the effectiveness of oxygen therapy.
• To assess the changes in oxygen concentration under physical exertion.
• To determine if someone needs help with breathing.
• To monitor blood oxygen levels during surgery, especially if sedation is involved.
• To diagnose cases of sleep apnea during a sleep study.

How to Use a Pulse Oximeter?

Using a pulse oximeter is extremely simple. Since it is a clamp-like device, all you have to do is attach it to your finger, and it will start giving you reading of your oxygen concentration. Because it is such a small and simple device, it is commonly used for home-based oximetry. You don’t need any training either to use it or to understand it. Some basic information is all that’s necessary to understand its readings.

There are certain things that can interfere with the results of the device. The following are some of the things you should keep in mind:

• Poor blood circulation to the fingertips can result in inaccurate readings.
• Dark nail polish can affect the device’s accuracy.
• Cold hands can also alter the readings of the device.
• Some medical conditions can affect the results such as heart disease.

What is the Normal Pulse Oximeter Reading?

Aside from the few things mentioned above, pulse oximetry is a remarkably accurate test. So, what is the normal pulse oximeter reading? Typically, blood oxygen saturation level should be at least 89 percent.

Most healthy people have a blood oxygen saturation level of 95 and 97 percent. Oxygen concentration level of 92 percent of below can indicate a potential for hypoxemia, an oxygen deficiency in the tissues. Anything below 89 percent oxygen concentration is dangerous. Although a brief decline in oxygen concentration is not considered dangerous or harmful, if it happens regularly, it can pose a serious risk to our health.

Conclusion: Few Things to Keep in Mind

Before we end the article, there are a few things you should keep in mind. Oximeters are nothing more than medical devices. They are generally reliable, but far from perfect. It may be a lot of times, but it certainly isn’t an absolute measure of your health. Like any tool, its effectiveness depends on how you use it.

One of the most helpful things you can do is create a record of your oximetry readings. There is no much value in one particular reading in isolation. However, if you regularly log your oxygen saturation levels, you might be surprised to find out how insightful long-term data can be.

Analyzing oximetry readings over long periods of time can help you figure out prevalent physiological patterns in your blood concentration. Such insight can be used to make changes in your lifestyle that can have a long-lasting effect on your health and wellness.

Oxygen levels and Covid-19

Vital signs, those fluorescent green numbers that beep, ding, and dash across black screens on the monitors in hospital rooms, have become a new source of angst during the coronavirus pandemic.

One of those vital signs is blood oxygen level, and in the hospital, it's measured with a pulse oximeter. These devices are attached to your finger and use a beam of light to measure oxygen in the blood.

Patients with Covid-19 can sometimes have relatively mild symptoms and seem to be perfectly oxygenated, even while their blood oxygen levels are perilously low. As a result, they may need an emergency supply of supplemental oxygen.

Covid-19 patients healthy enough to be discharged are often sent home with instructions to self-monitor, which has triggered a demand for pulse oximeters you can buy and use at home.

The tiny devices, which range in price from $20 to $200, clamp snugly over the index finger and display the percentage of oxygen being carried around by your blood. But how accurate are they? And how do you read them?

Three doctors, all of whom were on the coronavirus frontlines during the first peak in hard-hit New York City, warn that the results and efficacy can differ from unit to unit.

The Food and Drug Administration (FDA) considers pulse oximeters to be prescription medical devices, but most of those sold on the internet or in drugstores are labeled 'not for medical use' and have not been reviewed for accuracy. Still, having a pulse oximeter on hand may come in handy, as long as users exert common sense.

Consumers should use the devices while under a physician's care and follow up if blood oxygen readings seem to dip precipitously, especially when paired with symptoms like shortness of breath, cough, and fever.

Here's what you need to know about checking oxygen levels with a pulse oximeter at home.

Understanding normal oxygen levels

The average person takes about 20,000 breaths a day. Keeping normal oxygen levels is a finely-tuned science.

'We've got to get oxygen from the atmosphere into our lungs; we've got to get the oxygen from our lungs into our bloodstream, and then we've got to get the blood to our cells, and our cells have to take out that oxygen. So, all those things have to work right for things to go well,' explains Amit Uppal, MD, director of critical care at Bellevue Hospital in New York City.

To date, Dr. Uppal says he's overseen the treatment of more than 300 Covid-19 patients, all with varying levels of blood oxygen.

What is a good oxygen level?

'Normal people who have working lungs, and all those steps are going well, their blood oxygen level will usually be 96-100 percent,' adds Dr. Uppal.

A few notches down at 94 percent, he says, will be considered 'abnormal,' but that won't necessarily be cause for alarm. 'For the vast majority of people, nothing bad will happen. Nobody's going to have a cardiac arrest with a blood oxygen level in that [94] range.'

If someone has heart or lung disease, says Dr. Uppal, those 'normal' numbers may be a bit lower. There is, however, a universal threshold that signifies a dangerous situation.

'I think anything below 90 we definitely get very concerned. When it gets down into the 80 percent range or less than 80 percent range is when really bad things can happen.'

There is a possibility an individual's oxygen levels can be too high. However, this often occurs in people who are on supplemental oxygen.

High levels can be measured via an arterial blood gas (ABG) test, which is accurate, but invasive. This is a blood test that requires blood to be drawn from the artery, which is usually done in the wrist.

This measures your blood oxygen level and can also detect other gas levels in the blood, as well as your pH, or how acidic your blood is.

What happens when blood oxygen dips too low

When your blood oxygen reading falls below that 90 percent threshold, you'll likely feel a variety of symptoms.

'It includes feeling short of breath, and increased respiratory rate. So, if you're at rest and noticing that you're having to work hard to breathe, that's a sign,' says Reed Caldwell, MD, chief of service at NYU Langone's Cobble Hill emergency department.

You could also experience cyanosis, meaning you could turn blue or gray due to the blood's poor oxygenation, or you might have confusion, adds Dr. Caldwell.

'Your brain thrives on oxygen,' says Dr. Caldwell. 'So, people can be confused—or even unconscious.'

One of the more concerning Covid-19 symptoms

Infectious disease epidemiologist Syra Madad studied and led response teams during some of this generation's most serious health crises including Ebola, Zika, and measles. But she says nothing frightens her more than Covid-19.

'From my standpoint, and all the different epidemics I've responded to, this has been something I have never seen before,' says Madad, who is the senior director of the system-wide special pathogens program at New York City Health + Hospitals.

Last fall, she asked Congress not to let a pandemic-protection bill lapse and is now dealing with the fallout as the U.S. currently has 500,000-plus deaths from Covid-19 and counting. (It's documented in a new Netflix documentary, Pandemic: How to Prevent an Outbreak, featuring Madad.)

'Some people will be perfectly fine and have no issues,' says Madad. 'And other people will come in with their oxygen saturation levels below 94, 93, 92 percent, or even lower than that. And they look perfectly fine. It's one of those silent hypoxic killers almost.'

What is hypoxemia?

When someone is hypoxic, they're experiencing hypoxia or the absence of enough oxygen inside the body's tissues to sustain bodily functions. (A similar term, hypoxemia, means low oxygen levels in the blood, rather than the body's tissues.)

Covid-19 patients with this sign have been dubbed as having 'happy hypoxia.'

Instead of gasping for air, they're texting on their smartphones. 'They're not showing the signs and symptoms like bluish lips, trouble breathing, anything like that,' says Madad. 'So you have no idea they're experiencing this symptom, and then you check their blood oxygen levels, and you realize they're at very alarmingly low levels.'

In a June article in the Journal of Medical Systems, author Jason Teo further explained how silent hypoxia sneaks up on people.

'The air sacs in Covid-19 patients' lungs do not fill with fluid or pus as in normal pneumonia infections but rather the virus only causes the air sacs to collapse, thereby reducing the oxygen levels that lead to hypoxia in these patients but still maintains the lungs' normal ability to expel carbon dioxide,' wrote Teo.

He proposes that smartphone-based oximeters may one day unlock the key to more widespread early detection.

How to check blood oxygen using a pulse oximeter

Although they were scarce early in the pandemic, pulse oximeters are now easy to find. (An Amazon search returns 1,000 results.) Many are battery-powered and simply need to be turned on and placed on your index finger.

Pulse oximeters display two readings—one is SpO2, which is the oxygen saturation level in your blood, and your pulse rate.

'Monitoring [with an oximeter] is OK as long as you're under the guidance of a medical physician,' says Dr. Caldwell. 'I think it could be a potentially disastrous situation to be in if people take it upon themselves to just look up the numbers on the internet and then monitor their oxygen.'

Also, warns Dr. Uppal: 'I don't think that the general public of people who have no symptoms and have not tested positive for Covid-19 need to be checking their pulse oxygen 10 times a day.'

When to call a doctor

Early intervention could improve health outcomes for patients presenting with lowered blood oxygen. People with low oxygen levels will often require supplemental oxygen to increase their oxygen saturation.

'We know that some people are still kind of avoidant of health care because they are afraid to get Covid-19,' says Dr. Caldwell. 'And if you can't breathe, you need to be seen. And if your oxygen level is low, you need to be evaluated because your chances of a bad outcome trying to manage [while] stuck at home, it still needs to outweigh your chance of your family picking up something in a health care setting.'

Or, someone could have something other than Covid-19 altogether. 'A blood clot in your lung can give you low oxygen' notes Dr. Caldwell, 'that's something that would need prompt attention.'

Now, doctors may also suggest home supplemental oxygen, which is prescribed. Your doctor will provide specific instructions for using home supplemental oxygen to prevent any serious complications.

Preventing Covid-19

Dr. Uppal says he has had the fortune of helping some of his Covid-19-patients recover and the misfortune of saying goodbye to others. This includes longtime colleagues for whom he fought hard for.

A particularly heart-wrenching case, he remembers, was a mother and father who passed away due to Covid-19, orphaning their two young children.

Today, nearly an entire year into the pandemic, Dr. Uppal says there are far more tools in physicians' toolbox to fight back against respiratory diseases like Covid-19.

What Is Good Pulse Reading

'Steroids seem to help patients who start to deteriorate. It seems to reduce the likelihood that they end up on a breathing machine or reduce the likelihood that they end up in the ICU,' Dr. Uppal says. 'Remdesivir seems to help reduce the severity in patients. And some data just came out that a drug called tocilizumab also is beneficial.'

Normal Pulse Rate For Men

But nothing used to treat Covid-19 is as useful as taking measures to prevent it.

'I think what I'd like to emphasize is that getting better at treating the disease once people have it doesn't make it go away.' Dr. Uppal adds, 'The thing that we're still going to have to lean on is preventing it from spreading in the first place.'

Normal Pulse Level For Women

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