- Our European customers know us as O2. We are present in UK, Germany and Spain. We were created around a simple customer insight. That mobile's are as essential to us as our wallet and keys. And it's never been truer than it is today. It was the foundation of our name, our logo and our brand identity. But our brand's way more than that.
- Low blood oxygen, known as hypoxemia, means that the level of oxygen in the blood has dropped below average, normal levels, due to one or more of many different causes. Under most circumstances, breathing room air, normal readings range from 95 to 100 percent.
The shortage of medical oxygen is worsening across the nation. Prime Minister Narendra Modi held a meeting with the leading oxygen manufacturers in the count.
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.
© Kayoko Hayashi/Getty ImagesUnderstanding 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.
'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.'
But nothing used to treat Covid-19 is as useful as taking measures to prevent it.
O2 Levels And Covid
'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.'
The post What Is a Normal Oxygen Level and How Can I Check Mine? appeared first on The Healthy.
How does COVID-19 lower a person’s oxygen levels?
Many people with COVID-19 have low levels of oxygen in their blood, even when they feel well. Low oxygen levels can be an early warning sign that medical care is needed.
What is a pulse oximeter?
A pulse oximeter measures how much oxygen is in someone’s blood. It is a small device that clips onto a finger, or another part of the body. They are used often in hospitals and clinics and can be bought to use at home.
Many people consider oxygen level an important sign of how well a body is working, just like a person’s blood pressure or body temperature. People who have a lung or heart condition may use a pulse oximeter at home to check how they are doing, as directed by their health care provider. People can buy pulse oximeters without a prescription at some pharmacies and stores.
Can a pulse oximeter tell if someone has COVID-19 or how well they are doing if they have it?
We do not recommend using a pulse oximeter as a way to tell if someone has COVID-19. Get tested if you have signs of COVID-19 or if you have been close to someone who has it.
If someone has COVID-19, a pulse oximeter may help them keep watch over their health and to know if they need medical care. However, while a pulse oximeter may help someone feel like they have some control over their health, it does not tell the whole story. Oxygen level measured by a pulse oximeter is not the only way to know how sick someone is. Some people may feel very sick and have good oxygen levels, and some may feel OK, but have poor oxygen levels.
Pulse oximetry results may not be as accurate for people with darker skin. Their oxygen levels are sometimes reported as higher than they really are. People who check their own oxygen levels, or those who check it for them, should keep this in mind when looking at results.
Oxygen levels may be low if someone feels short of breath, is breathing faster than usual, or feels too sick to do their usual daily activities, even if a pulse oximeter says their oxygen levels are normal. Call a doctor or another health care provider right away if you have these symptoms.
What are normal readings?
A normal level of oxygen is usually 95% or higher. Some people with chronic lung disease or sleep apnea can have normal levels around 90%. The “SpO2” reading on a pulse oximeter shows the percentage of oxygen in someone’s blood.
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If your home SpO2 reading is lower than 95%, call your health care provider.