Two large analyses with more than five million measurements show that lower grip strength is gradually associated with a higher risk of mortality. A declining trend in repeated measurements is the primary signal for concerning muscle loss. For a complete diagnosis of sarcopenia, a physician also looks at walking speed and muscle mass.
Grip strength is one of the better simple measurements you can take of your physical condition. Two large analyses, together based on more than five million measurements in adults, show that people with lower grip strength consistently have a higher chance of dying earlier, including from cancer and cardiovascular disease, and that this relationship is gradual: not a threshold at which things suddenly shift, but a continuous line. That makes it useful as a personal reference point.
What you can do with it: a single measurement tells you something when you compare it with reference values for your age and sex, but you get the most out of it by repeating it over time. A declining trend is the signal to respond to seriously; a stable or rising value is reassuring. It is not a diagnosis of muscle loss in itself -- for that a doctor also looks at walking speed and muscle mass -- but it works well as a screening measure. Whether higher grip strength directly extends life or is simply a reflection of broader health is something these studies cannot answer, but as an indicator of how you are doing physically compared with people your own age, it is well supported.
You can be measured at your GP, a physiotherapist, or a geriatric check-up, but a simple hand-grip dynamometer for home use costs little and makes follow-up easy. The gripping itself is completely safe, with the caveat that a painful hand or joint complaints can lower the result without this reflecting actual muscle strength.
Strong evidence, based on 2 source(s), including controlled or causal research.