The length of your upper leg could help detect diabetes
A new home test can detect type 2 diabetes or prediabetes with high accuracy. The test has been developed using artificial intelligence and large amounts of health data – and surprisingly, one of the steps involves measuring the length of your thigh.
Seven measurements need to be entered into a new online test that identifies the risk of type 2 diabetes or prediabetes. Photo: Colourbox
Wednesday 29 July 2026
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According to The Danish Diabetes Association, around 100,000 Danes are unaware that they have type 2 diabetes, and approximately half a million Danes are estimated to have a precursor to type 2 diabetes, also known as prediabetes.
Now researchers have developed an online test that you can take at home and find out if you are at risk of having type 2 diabetes or prediabetes.
“Type 2 diabetes is easy to diagnose with a blood test, but if you don’t suspect you have it, you won’t go to the doctor to have one done. That’s why an online test at home can encourage people to see a doctor,” says postdoc Daniel Yoo, DTU Sustain, who has been the driving force behind the new online test.
Type 2 diabetes is the most common form of diabetes in Denmark and accounts for 80 percent of all people with diabetes. Since diabetes can lead to a number of serious complications and costs Danish society at least DKK 13.3 billion per year, detecting people with prediabetes or unrecognized diabetes is an important health-promoting task.
"At The Danish Diabetes Association, we welcome any effort to detect type 2 diabetes and prediabetes earlier. The sooner we find people at risk, the better we can prevent serious complications such as cardiovascular disease, kidney failure and vision loss," says Tanja Thybo, Head of Research & Knowledge at The Danish Diabetes Association.
Facts
About type 2 diabetes and prediabetes
Prediabetes is a condition in which blood sugar levels are higher than normal, but not high enough to be classified as type 2 diabetes. Pre-diabetes is also referred to as a precursor to type 2 diabetes. There are virtually no symptoms of pre-diabetes. In type 2 diabetes, symptoms may include:
Lack of energy – tiredness, nausea, poorer general health
Thirst
Frequent urination
Unexplained weight loss
Vision problems
Itching around the genitals
Infections of the skin and mucous membranes
AI as a tool
The new test is called MEDWACS. It was developed in collaboration between Daniel Yoo and DTU colleague Professor Olivier Jolliet, as well as the Italian doctor Umberto Maggiore, who is specialized in kidney diseases, which are frequent complications of diabetes. Their work has been published in the Journal of Clinical Epidemiology.
MEDWACS was developed using artificial intelligence and large amounts of US health data from the National Health and Nutrition Examination Survey, collected over 30 years for both sexes aged 18 and up.
The researchers have carried out two external validations of the test tool, testing it on data from two populations in the US and South Korea, where the number of people with and without the condition is known.
The validations show that MEDWACS is highly effective at detecting people with prediabetes or undiagnosed type 2 diabetes, performing on par with or exceeding other recognized testing methods.
"The new tool from DTU is an interesting contribution, and it is promising that it has been validated in several populations. In The Danish Diabetes Association, we use the Leicester Risk Assessment, which is a simple and well-tested method for rapid detection. It requires few measurements and is easy to use in the field. It has a precision that is on par with the new tool," says Tanja Thybo.
Measure your thigh
In MEDWACS – as in similar tests – you must answer questions such as age, gender and BMI. These questions are based on seven parameters that the research team selected from nearly 3,700 possible options.
All seven parameters can be measured at home using a tape measure, bathroom scales and a standard blood pressure monitor.
The most surprising parameter is the length of your thigh, which can help reveal your risk of type 2 diabetes or prediabetes. A parameter that initially surprised the research team as well. But Umberto Maggiore, the medical expert, can explain why this curious measurement is interesting in the context of diabetes:
“The length of the femur bears witness to nutrition in early childhood. Poor nutrition in the first years of life slightly inhibits bone growth and is closely linked to an increased risk of diabetes decades later. Furthermore, the body’s largest muscle group is also located in the thighs, and these muscles are responsible for removing sugar from the blood. Overall, shorter legs mean that a person has less muscle mass to absorb that sugar, which increases the risk of diabetes.”
The researchers assume that the thigh measurement is still relevant for Danes, even though it is a parameter based on health data from the US and South Korea.
“The length of the femur bears witness to nutrition in early childhood. Poor nutrition in the first years of life slightly inhibits bone growth and is closely linked to an increased risk of diabetes decades later."
Professor Umberto Maggiore
University of Parma
Danes can also use the test
The researchers assume that the thigh measurement is still relevant for Danes, even though it is a parameter based on health data from the US and South Korea.
To be absolutely certain that the test is just as accurate at identifying high-risk patients in Denmark, it must be validated against health data from the Danish population, but the research team behind MEDWACS believes there is a good chance the tool will work here too.
“When MEDWACS performs so well on populations as diverse as the American and South Korean ones, we are confident that the test will also be able to detect Danes with diabetes or prediabetes. But of course, this is something we will need to test to be certain,” says Daniel Yoo.
At The Danish Diabetes Association, they follow the development of new tools closely and are always interested in new solutions, says Tanja Thybo:
"It will be interesting to see whether MEDWACS can be adapted and validated in a Danish population in the long term. There are still 100,000 Danes walking around with undiagnosed diabetes. That's why we are happy about all research that can make us better at finding them."
Facts
About MEDWACS
The MEDWACS test can assess your risk of having type 2 diabetes or prediabetes.
The test is designed for adults (aged 18 and over) who have not previously been diagnosed with diabetes.
The test has been validated using US and South Korean health data and performs better than similar tests.
You can access the test online, where you will be asked to provide your age, gender, BMI, waist circumference, systolic blood pressure, upper arm circumference and thigh length.
MEDWACS was developed by postdoc Daniel Yoo and Professor Olivier Jolliet, both from Section for Quantitative Sustainability Assessment at DTU Sustain, in collaboration with the Italian doctor and researcher Umberto Maggiore, University of Parma.
The research has been published in the Journal of Clinical Epidemiology.
The Novo Nordisk Foundation has funded the project.
MEDWACS has paved the way for new applications, and the research team has just put the finishing touches on a testing tool that can identify patients at high risk of kidney disease.
