Can't Lose Weight? Blood Test for the Cause | Nuvivo Health – Nuvivo Health – Private Blood Tests

16 Biomarkers | Venous Blood Test | CE-marked | UKAS-accredited | Doctor-reviewed results with personalised interpretation.

An advanced blood test checking markers linked to difficulty losing weight, including thyroid function, thyroid antibodies, reproductive hormones, testosterone, cortisol and DHEA-S. Designed for people who feel they cannot lose weight despite diet and lifestyle changes, this test gives clear, clinically reviewed insight into possible hormonal, thyroid and stress-related contributors so you can understand your results and know what to do next.

Results are typically available within 2 working days from when your sample reaches the laboratory, excluding weekends and bank holidays.

£99.00

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Choose your sample collection method: Book a venous draw at our Livingston clinic Book a venous draw at home with a nurse +£63 Self-arrange a professional sample collection Partner clinic visit + £35.00 Finger Prick

Follicle Stimulating Hormone, FSH
Luteinising Hormone, LH
Oestradiol
Progesterone
Prolactin
Testosterone
Sex Hormone Binding Globulin, SHBG
Free Androgen Index or Free Testosterone Calculation

Cortisol
DHEA-S / DHEA Sulphate

Thyroid Peroxidase Antibodies
Thyroglobulin Antibodies

TSH
FT4
FT3
Thyroxine, T4

Fasting required 8–12 h before the test (water only) recommended for glucose, cholesterol/triglyceride accuracy
Sample timing: between 7:00 AM – 10:00 AM
Stay hydrated; avoid strenuous exercise, heavy meals, and supplements (iron, B12, multivitamins, biotin) for 48 hours prior
Continue prescribed medications unless otherwise directed

Frequently asked questions

It is for adults who are eating well and exercising but seeing little change on the scales. It looks at the internal factors that can make weight loss harder, including thyroid function, blood sugar and insulin regulation, and hormones that influence appetite and fat storage.

Yes. Please fast for 10 to 12 hours before your appointment, drinking only water. Fasting is required because glucose and insulin readings are strongly affected by recent food, and those markers are central to this panel.

It can identify measurable physiological factors that make weight loss harder, such as an underactive thyroid or insulin resistance. It cannot account for every cause, as sleep, stress, medication and calorie intake also play a large part. Your doctor-reviewed report explains what your results suggest and what to consider next.

That is a genuinely useful outcome. It rules out the common hormonal and metabolic causes, which means the focus can shift confidently to diet composition, activity, sleep and stress rather than wondering whether something underlying is being missed.

Yes. A qualified nurse can visit your home to take the sample, or you can attend our Livingston clinic or a partner clinic. As you need to fast, most people prefer an early morning appointment.