Oximeters may be less accurate on black or brown skin, says new NHS guidance

The NHS said the devices ‘may be less accurate if you have brown or black skin’

<p>Oximeters are used on people with Covid-19 to make sure their oxygen levels do not drop to dangerous lows</p>

Oximeters are used on people with Covid-19 to make sure their oxygen levels do not drop to dangerous lows

Official NHS guidance has been changed for the use of blood oxygen monitors after it was found that they may not be as accurate when used on black and minority ethnic people.

Oximeters can overestimate the amount of oxygen in people who have deeper skin tones, according to NHS England and the Medicines and Healthcare products Regulatory Agency (MHRA).

Pulse oximeters are devices costing around £20 that typically clip on to a person’s finger. The devices send beams of light through the skin to measure oxygen levels in the blood.

More than 300,000 were sent out by NHS England so that Covid-19 patients are able to monitor their oxygen levels at home if they are not unwell enough to go to hospital.

The NHS website has been updated with a clarification for oximeter users who have dark skin.

It reads: “There have been some reports [oximeters] may be less accurate if you have brown or black skin. They may show readings higher than the level of oxygen in your blood.

“You should still use your pulse oximeter if you’ve been given one. The important thing is to check your blood oxygen level regularly to see if your readings are going down.”

The NHS also says that changes in the regular oximeter readings should be noted over time – rather than just the first reading being taken into account.

The guidance states: “By looking at changes in readings rather than just one reading, it means that even if an oximeter is not completely accurate, it is still possible to see if oxygen levels are going down.”

It comes after a disproportionate number of black, Asian and minority ethnic people have died with Covid-19 throughout the pandemic.

Dr Habib Naqvi, director of the NHS Race and Health Observatory, told Radio 4's Today programme on Saturday that concerns about the reliability of oximeters when used on people with deeper skin tones have increased over some time.

He said: “We have growing evidence highlighting inconsistencies in pulse oximeter readings amongst those with darker skin tones.

“It cannot and should not be ignored, particularly during the current Covid pandemic that is significantly having a disproportionate impact upon black and ethnic minority people.”

The potential limitations of all healthcare equipment on minority ethnic groups and those more susceptible to certain illnesses should be made “common knowledge”, he also said.

The NHS’s guidance change comes after the NHS Race and Health Observatory published a review into the accuracy of oximeters in April.

The review, by Dr Olamide Dada of Cardiff University School of Medicine, cites evidence from more than 30 years of inaccurate readings for those with deeper skin tones.

A normal oxygen level in the blood is between 95 per cent and 100 per cent. There are reports that many people suffering from Covid-19 with oxygen levels ranging between 70 and 80 per cent have been admitted to hospital.

Oxygen levels in the blood can drop to dangerously low levels without the patient noticing, in what is known as “silent hypoxia”. People whose oxygen levels have fallen below 92 per cent are urged to go to A&E for medical attention.

Register for free to continue reading

Registration is a free and easy way to support our truly independent journalism

By registering, you will also enjoy limited access to Premium articles, exclusive newsletters, commenting, and virtual events with our leading journalists

Please enter a valid email
Please enter a valid email
Must be at least 6 characters, include an upper and lower case character and a number
Must be at least 6 characters, include an upper and lower case character and a number
Must be at least 6 characters, include an upper and lower case character and a number
Please enter your first name
Special characters aren’t allowed
Please enter a name between 1 and 40 characters
Please enter your last name
Special characters aren’t allowed
Please enter a name between 1 and 40 characters
You must be over 18 years old to register
You must be over 18 years old to register
Opt-out-policy
You can opt-out at any time by signing in to your account to manage your preferences. Each email has a link to unsubscribe.

By clicking ‘Create my account’ you confirm that your data has been entered correctly and you have read and agree to our Terms of use, Cookie policy and Privacy notice.

This site is protected by reCAPTCHA and the Google Privacy policy and Terms of service apply.

Already have an account? sign in

By clicking ‘Register’ you confirm that your data has been entered correctly and you have read and agree to our Terms of use, Cookie policy and Privacy notice.

This site is protected by reCAPTCHA and the Google Privacy policy and Terms of service apply.

Register for free to continue reading

Registration is a free and easy way to support our truly independent journalism

By registering, you will also enjoy limited access to Premium articles, exclusive newsletters, commenting, and virtual events with our leading journalists

Already have an account? sign in

By clicking ‘Register’ you confirm that your data has been entered correctly and you have read and agree to our Terms of use, Cookie policy and Privacy notice.

This site is protected by reCAPTCHA and the Google Privacy policy and Terms of service apply.

Join our new commenting forum

Join thought-provoking conversations, follow other Independent readers and see their replies

Comments

Thank you for registering

Please refresh the page or navigate to another page on the site to be automatically logged inPlease refresh your browser to be logged in