FGF21 blood test in Chiswick
A blood test for FGF21, an emerging marker of metabolic stress linked with fatty liver, insulin resistance and metabolic syndrome.
What the test measures
Fibroblast growth factor 21 (FGF21) is a hormone made mainly by the liver. It helps the body manage blood sugar, fat use and energy balance. Higher levels have been linked in research with obesity, metabolic syndrome, fatty liver disease (now often called MASLD), type 2 diabetes and heart risk factors.
FGF21 is an emerging marker. It is not yet part of routine NHS testing and there is no single agreed cut off, so it is best used alongside established checks such as liver function, blood sugar, cholesterol and insulin resistance.
The price covers your sample taken at our Chiswick clinic, analysis at the Randox accredited laboratory and a clear results report. If you would like a doctor's view, a GP review and consultation can be arranged on request, at an additional cost.
Who it is for
- You want a deeper look at metabolic health, for example if you carry weight around the middle.
- You have been told you may have a fatty liver and want an extra marker to follow.
- You are working on weight, diet or exercise and want to track how your metabolism responds.
- You already have standard results and are curious about newer markers.
Understanding your result
Your report shows your FGF21 level alongside the laboratory reference range. A higher level may reflect metabolic stress or extra fat in the liver, but it does not diagnose a condition on its own. It is most useful when read together with liver tests, blood sugar and your lifestyle.
Preparing for your test
Fasting may be preferred so that results can be compared over time. We confirm the preparation, and the expected timing of your results, when you book.
FGF21 pairs well with our Metabolic Health Extended test and an insulin resistance check. You can also browse every blood test and price in Chiswick.
Outside London? We can arrange this test at a partner clinic near you, at the same price. See private blood tests across the UK.
Questions
How much is an FGF21 test in Chiswick?
The FGF21 test is £159. It includes the sample at our Chiswick clinic, analysis at the Randox accredited laboratory and your results report. A GP review and consultation are available if you need them, at an additional cost.
Can FGF21 diagnose fatty liver?
No. It can support the picture, but fatty liver is assessed with liver blood tests, scores such as FIB-4 and, where needed, a scan.
Should I take this test instead of a liver function test?
No. A liver function test or metabolic panel is the better starting point. FGF21 adds an extra layer for people who want more detail.
