What BMI Do You Need for Weight Loss Injections?
What BMI Do You Need for Weight Loss Injections?
If you are considering weight loss injections such as Wegovy or Mounjaro, one of the first things you may want to know is whether your BMI is high enough to qualify.
For most adults using these medicines specifically for weight management, the basic UK criteria are:
- BMI of 30 or above, or
- BMI of 27 to 29.9 with at least one weight-related health condition
However, BMI is only one part of the assessment. Your medical history, current medication and overall health also need to be considered before treatment can be prescribed.
What is BMI?
BMI stands for Body Mass Index.
It uses your height and weight to give a simple indication of whether your weight falls within a healthy range.
For adults, BMI is generally classified as:
- 18.5 to 24.9: healthy weight
- 25 to 29.9: overweight
- 30 to 34.9: obesity class 1
- 35 to 39.9: obesity class 2
- 40 or above: obesity class 3
BMI is useful as a screening tool, although it does not tell the whole story about a person's health.
What BMI do you need for Mounjaro?
Mounjaro contains the active ingredient tirzepatide.
For weight management in adults, Mounjaro is licensed for people with:
A BMI of 30 or above
or
A BMI of at least 27 but below 30, together with at least one weight-related health condition.
These conditions can include:
- High blood pressure
- High cholesterol or abnormal blood-fat levels
- Prediabetes
- Type 2 diabetes
- Obstructive sleep apnoea
- Cardiovascular disease
This means you do not necessarily need a BMI above 30 to be considered for Mounjaro.
What BMI do you need for Wegovy?
Wegovy contains semaglutide and uses very similar eligibility criteria.
For adults using Wegovy for weight management, the licensed criteria are generally:
BMI 30 or above
or
BMI 27 to 29.9 with at least one weight-related health condition.
As with Mounjaro, meeting the BMI threshold does not automatically mean that the treatment will be suitable.
A clinician still needs to review your health and medical history before prescribing.
Can I get weight loss injections with a BMI under 30?
Potentially, yes.
If your BMI is between 27 and 29.9, you may still meet the licensed criteria for weight loss injections if you also have a qualifying weight-related health condition.
For example, someone with a BMI of 28 who also has high blood pressure may potentially meet the basic eligibility criteria.
Someone with the same BMI but no relevant weight-related health conditions would not normally meet the licensed weight-management criteria.
Can I get weight loss injections with a BMI under 27?
For Wegovy and Mounjaro when prescribed specifically for weight management, a BMI below 27 would generally fall outside the standard licensed eligibility criteria.
That is why it is important to provide accurate height and weight information during your assessment.
Your prescriber will use this alongside the rest of your medical information to decide whether treatment is appropriate.
Does a BMI over 30 mean I automatically qualify?
No.
A BMI of 30 or above means you may meet the basic BMI requirement, but it does not guarantee that a weight loss injection will be prescribed.
Your clinician may also need to consider:
- Your medical history
- Current medication
- Previous weight-loss treatment
- Other health conditions
- Pregnancy or breastfeeding
- Whether there are any reasons the medicine may not be appropriate for you
- Which treatment, if any, is most suitable
Weight loss injections are prescription medicines, so an individual clinical assessment is always required.
Is the BMI requirement different on the NHS?
It can be.
The criteria for receiving weight loss injections through NHS services can be more restrictive than the medicine's licensed criteria.
For example, NICE recommendations for NHS use can include higher BMI thresholds, additional weight-related health conditions and requirements around specialist weight-management services.
Availability can also differ depending on where you live in the UK and what services are available locally.
This means someone who may be clinically eligible for private treatment will not necessarily qualify for treatment through the NHS.
Why does BMI matter for weight loss medication?
Prescription weight-management medicines are intended for people where excess weight is considered significant enough to create or increase health risks.
BMI provides clinicians with a standard way of assessing weight relative to height.
However, it is not a perfect measurement.
For example, BMI does not distinguish between muscle and body fat, and it does not directly measure where body fat is stored.
That is why a clinician considers BMI alongside your wider health rather than making a decision from one number alone.
How do I calculate my BMI?
BMI is calculated using your weight and height.
The formula is:
BMI = weight in kilograms ÷ height in metres²
For example, someone who weighs 95 kg and is 1.75 metres tall would have a BMI of approximately 31.
You do not need to calculate it manually when completing a Keltoi eligibility assessment. Your height and weight can be used to calculate your BMI for you.
Do I qualify for weight loss injections?
As a simple guide:
| Your BMI | Basic weight-management eligibility | |---|---| | Below 27 | Usually below the licensed BMI threshold | | 27 to 29.9 | May qualify if you have a weight-related health condition | | 30 or above | May meet the basic BMI criteria | | 35 or above | Meets the basic BMI threshold, but clinical assessment is still required |
Remember, these are only the starting criteria.
The final decision about whether a weight loss injection is appropriate for you must be made by a qualified prescriber.
Starting a weight management assessment
If you are unsure whether your BMI is high enough for weight loss injections, the simplest option is to complete an eligibility assessment.
At Keltoi, you can provide your height, weight and relevant health information online. A UK prescriber can then review your information and determine whether treatment is suitable.
There is no need to choose a medicine before your assessment. The available treatment options can be considered based on your individual circumstances.
Treatment is subject to clinical assessment. Prescription weight-management medicines are not suitable for everyone.