Skip to content
Free Shipping on orders over £30 / $38 USD

All things diabetes

A beginner's guide to driving, diabetes, and hypoglycemia

Published: 06 Jan 2022, Author: Charlie Cawsey

What MMOL should my sugars be at to drive?

“5 to drive!” This is something that I was told by my NHS endocrinologist that has stuck with me. Before driving I always check that my sugars aren’t below 5.0 mmol with my blood glucose meter. It’s always best to do a manual prick test, and do not rely on a continuous glucose monitor like a Dexcom G6 or Freestyle Libre.

But why is it best to use a blood glucose meter to test before driving?

Continuous glucose monitors like Dexcom G6 and Freestyle Libre measure blood sugar through the interstitial fluid, whilst a blood glucose meter measures it directly from your blood. This means that your blood glucose meter is slightly more accurate and is not as affected by site compression as much as your CGM readings will be. Also, we’ve all seen our Dexcom or Freestyle Libre be completely off and have to do a manual blood glucose test anyway!

How to test your blood glucose manually so you can see if you are safe to drive

Your blood glucose meter could save your life

The risk of hypoglycemia is the main danger to safe driving. If your Dexcom G6 or Freestyle Libre gives you the wrong reading, and you don’t know, you could start to experience hypoglycemia symptoms whilst at the wheel. That is serious. Many of the accidents that have happened due to hypoglycemia have occurred because drivers have ignored warning symptoms of hypoglycemia and have carried on driving, thinking they’ll be okay.

Unfortunately, almost 100% of drivers that have suffered an accident owing to the sudden unset of hypoglycemia symptoms did not plan on it, or were not expecting it, and likely thought they would be okay. Obviously, you wouldn’t drive if you thought you wouldn’t be okay. But we all know hypoglycemia can hit us suddenly & fast, so we should be prepared and do our due diligence with a blood glucose test.

What the UK government say about driving & hypoglycemia

The below points are taken from the website and DVLA guide.

  • Always carry your glucose meter and test strips with you even if you have a CGM.
  • You should check your glucose levels less than 2 hours before driving and every 2 hours after the journey as started.
  • If glucose is 5.0mmol or less, eat a snack. If it is less than 4.0mmol or you feel hypoglycemic do not drive.


You must stop and wait for your blood sugar to increase. Stop sign.

What if I have a hypo WHILST driving?

It is critical to carry an emergency supply of a fast-acting glucose carbohydrate such as glucose tablets in the car with you. If hypoglycemia occurs whilst driving then you should stop the vehicle safely as soon as possible. The DVLA says that if this happens you should switch the engine off, remove the keys from the ignition and move out of the driver’s seat. Even if you are in a rush to get somewhere you must wait 45 minutes after the blood sugars have returned to 5.0mmol. This is because it takes up to 45 minutes for the brain to fully recover from a hypo. After all, that’s why hypoglycemia symptoms can cause us to lose control of our bodies – because our brains are not functioning correctly without glucose.

You must then test glucose levels using a finger prick test reading, and not a CGM.

The DVLA has said that drivers who have any form of diabetes treated with any insulin preparation must inform the DVLA.

More information can be found via the link below and you can read more of our blogs here.


This information is a guide and referenced from the DVLA website. Please see our editorial policy for more information. This information may not be applicable in your country and is intended for a UK audience. Everybody’s diabetes is different and you must consult your doctor or care-giver. This is not medical advice.


930 x 520px


Sample Block Quote

Praesent vestibulum congue tellus at fringilla. Curabitur vitae semper sem, eu convallis est. Cras felis nunc commodo eu convallis vitae interdum non nisl. Maecenas ac est sit amet augue pharetra convallis.

Sample Paragraph Text

Praesent vestibulum congue tellus at fringilla. Curabitur vitae semper sem, eu convallis est. Cras felis nunc commodo eu convallis vitae interdum non nisl. Maecenas ac est sit amet augue pharetra convallis nec danos dui. Cras suscipit quam et turpis eleifend vitae malesuada magna congue. Damus id ullamcorper neque. Sed vitae mi a mi pretium aliquet ac sed elitos. Pellentesque nulla eros accumsan quis justo at tincidunt lobortis deli denimes, suspendisse vestibulum lectus in lectus volutpate.
Prev Post
Next Post


14 May 2022 H.Cellar

Reply to Lara…
My insurance tried that with me. I appeal everytime my insurance denied me if any diabetic supplies. Then they usually approve it. My Endocrinologist says I still need strips to check my glucose, as my cgm may be off and needs calibrated. Glucose strips are as needed as much as insulin for type one diabetics. Always appeal your insurance if they are the ones giving you this option. Walmart sells strips really cheap for Rely monitoring products. Your Endocrinologist will also help you, make sure to ask for help. A diabetes Educator is a huge help also for these type of things. Best of luck. I hope I helped.

02 Feb 2022 Lara

I have always been advised to only drive if blood test has been performed. I’d like to know if others are experiencing same as me from GPs. I’ve been told I’m no longer entitled to blood strips because I’m prescribed the libre…..

Leave a comment

Please note, comments need to be approved before they are published.

Thanks for subscribing!

This email has been registered!

Shop the look

Choose Options

Edit Option
this is just a warning
Shopping Cart
0 items
logo-paypal paypal