Skip to content
Weight Loss Blood Test

Weight Loss Blood Test


A test for men and women to help identify reasons why you might be struggling to lose weight. Includes tests for anaemia, thyroid function and cholesterol as well as tests for stress, diabetes and hormones.
Blood sample 24 biomarkers included Results estimated in 4 working days from sample receipt at lab
Weight Loss Blood Test
Weight Loss Blood Test
Weight Loss Blood Test
Weight Loss Blood Test

Is it for you?

Are you gaining weight for no reason and want to know if your hormones are to blame? Do you try one diet after another but never seem to get anywhere? You know that carrying extra weight increases your risk of certain conditions such as diabetes and heart disease and you want to know where you stand? If want to check whether there are any medical causes for stubborn weight gain, then this is the test for you.

What's included?

Biomarker profiles

  • Hormones
  • Cholesterol Status
  • Diabetes
  • Iron Status
  • Thyroid Hormones
  • Vitamins
  • Adrenal Hormones
  • Liver Health
  • Inflammation
  • Muscle Health

Hormones (3 Biomarkers)

Cholesterol Status (6 Biomarkers)

Diabetes (1 Biomarker)

Iron Status (4 Biomarkers)

Thyroid Hormones (2 Biomarkers)

Vitamins (1 Biomarker)

Adrenal Hormones (1 Biomarker)

Liver Health (4 Biomarkers)

Inflammation (1 Biomarker)

Muscle Health (1 Biomarker)

Special instructions

Prepare for your Weight Loss Blood Test by following these instructions. Please take your sample before 10am. Take this test when any symptoms of short-term illness have settled. Avoid heavy exercise for 48 hours beforehand. Avoid fatty foods for eight hours before your test, you do not need to fast. Take this test two to five days after the start of your period, ideally on day three. It can be taken any time if you do not have periods. Hormonal contraception can affect this test, taking a break from this and using barrier contraception will give more accurate results. Corticosteroid medication can affect this test, ask your doctor whether to stop before testing. Avoid taking your sample from a finger used to apply hormone gels/pessaries in the past 4 weeks. Use gloves to apply these. You should take this test before you take any medication or vitamin/mineral supplements. Do not take biotin supplements for two days before this test, discuss this with your doctor if it is prescribed.

From the expert

Losing weight is never easy and it can be difficult at the best of times to get into the right frame of mind to embark upon a weight loss programme. If you are tired, lack energy, or suffer from low mood and lack of motivation, then losing weight can be even more of a struggle.

This profile investigates possible causes for your weight loss stalling, or for gaining weight unexpectedly.

It also looks at some important health markers like cholesterol and liver health which help you understand your health status, Key tests include iron and vitamin D to help identify why you might lack the energy and motivation to stick with your diet, thyroid function to see if your metabolism is causing you to gain weight and tests for cortisol and diabetes to see if stress or metabolic disease is causing you to store weight around your middle.

For men and women, changes in hormone balance can also affect body composition and weight control, which is why we look at testosterone and oestradiol as well as levels of FSH which can build a picture of whether a woman might be menopausal.

Dr Sam Rodgers MBBS, MRCGP
Chief Medical Officer

Why take this test?

  • You want to investigate whether there could be an underlying reason why you are struggling to lose weight
  • You're about to start a weight loss programme and you want to understand any health risks before you start
  • You want to know whether an underactive thyroid or a hormone imbalance could be causing you to gain weight
  • You know that there are health risks associated with being overweight and you want to check your health status

Laboratories you can trust

Trusted by the NHS and private clinics alike, you can be sure of the highest testing standards from our UKAS accredited partner laboratories.

Dr Sam Rodgers - Chief Medical Officer

Expert advice with your results

Get trusted advice and comments from one of our doctors based on your results.

Your personal health centre

Your personal health centre

Discover the easy way to track your health through our online portal, View your results with doctor's advice, monitor any changes over time and see the improvements you can make to your health with simple lifestyle changes.

Questions? Let us help
Questions? Let us help

Questions? Let us help

Our customer care team is on-hand to help you find the test that's right for you. Get in touch via phone, live chat or email.


Our tests are not a substitute for seeing your doctor, especially if you are suffering symptoms. Our doctors will interpret your results based on the information you have provided, but will not diagnose, consult or provide any treatment. You will be advised to see your doctor for any necessary follow-up action.