This is an important test that is typically used to diagnose leptin deficiency or monitor levels in obesity.

Venous blood
1 tests included
7 days turnaround



About Leptin

What is leptin?

Leptin is a hormone produced by adipose tissue and the small intestine. Leptin’s primary function is to signal to the hypothalamus to remove the feeling of hunger when enough food has been consumed, though there are many other functions that have not yet been fully defined.

In healthy individuals an increase in fat will result in increased leptin, as it is produced by fat tissues. This normally results in a lower appetite, leading to weight loss. In individuals with reduced fat, leptin decreases and leads to increased hunger and weight gain.

Obesity changes this balance, as chronically high levels of leptin lead to reduced sensitivity and a higher leptin threshold to satiate hunger. Leptin deficiency results in intense, insatiable hunger. This condition is rare but has been implicated in childhood obesity and delayed puberty. These individuals require leptin injections to manage hunger.

Why take the test?

This test measures the level of leptin in the blood. It is typically used to diagnose leptin deficiency or monitor levels in obesity.  


What's tested


How it works



Purchase your Kit

Just order a test online and get your kit delivered right to your door unless you are ordering a COVID-19 Fit to Fly test where you will be given appointment options to attend our clinics across the United Kingdom for a nose and throat swab PCR test at the checkout stage.



Take your test and post

Follow our simple instructions to take your sample and post back the enclosed prepaid envelope to our accredited lab for processing. We also offer home or workplace visits by a qualified nurse. For COVID-19 Fit to Fly tests you must attend one of our partner clinics for our trained collection officers to take your sample. You will then have the results emailed to you.



Get results directly to your dashboard

You will receive an email notification from our medical team when your results are available on your secure personalised health dashboard.