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We recommend that you do not collect or post samples between Tuesday 31st and Sunday 5th June.

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

Please take your sample as soon as possible after waking. CRP levels can be affected by infection, inflammation, and illness. If you are taking this test because you have recently developed symptoms or they are worsening you should discuss these with your doctor. We suggest taking your test when any short-term change in your symptoms have settled. Fasting is optional for this test. Eating fatty foods might affect the results of a small number of blood tests so we may advise a retest when you are fasted. If you are interested in your triglyceride or LDL levels, then we do recommend fasting. Take this test between days 2 and 5 of your period. It can be taken at any time if you are not having periods. Your result could be affected by corticosteroid medication (e.g. prednisolone). Ask your doctor whether you should stop before testing. HRT and the contraceptive pill can affect the results of this test, taking the test during a break from these will give more accurate results. Do not take biotin supplements for 2 days prior to this test. If you are taking prescribed biotin you should discuss this with your doctor. Avoid taking a finger-prick sample from a finger used to handle hormone-gels or hormone-pessaries in the past 4 weeks. You should take this test before you take any vitamin or mineral supplements. Avoid heavy exercise and eating meat-rich meals for 48 hours before your test.

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.