Weight Loss Blood Test
Feb 12, 2026
Weight Loss Blood Test
A weight loss blood test checks thyroid function, hormones, insulin resistance, and other metabolic markers that may be blocking your weight loss efforts—because if you're doing everything right but not losing weight, there may be a medical reason. Conditions like hypothyroidism, insulin resistance, and hormone imbalances can make weight loss almost impossible without treatment.
At Blood Test London, weight loss testing costs from £245 with results in 2-3 days.
What We Test
Thyroid Function
Underactive thyroid slows metabolism significantly. Even subclinical hypothyroidism can impair weight loss.
Insulin Resistance
Pre-diabetes and insulin resistance make the body store fat more easily and release it less readily.
Hormones
Testosterone (low T in men linked to weight gain)
Oestrogen/progesterone balance
Cortisol (chronic stress = belly fat)
Other Factors
Vitamin D (deficiency linked to obesity)
Inflammation markers
Liver function
Find Out What's Blocking Your Weight Loss
Common Medical Causes of Weight Gain
Condition | How It Affects Weight |
|---|---|
Hypothyroidism | Slows metabolism |
Insulin resistance | Promotes fat storage |
PCOS | Hormonal weight gain |
Cortisol excess | Belly fat accumulation |
Low testosterone | Muscle loss, fat gain |
Sleep apnoea | Disrupts hormones |
Book Your Weight Loss Test
Price: From £245 | Results: 2-3 days | Doctor review: A doctor always reviews every result
Blood Test London by The Wellness. Weight loss testing from £245.