It is sometimes difficult to judge a person's actual age just by looking at his appearance. An international research team recently developed a method of "blood drop age test", which can reliably judge a person's actual age and physical condition by detecting some protein levels in blood.
Related papers were recently published in the British journal Nature Medicine. Tony Wise-Corey, a professor at Stanford University, said that in the future, this technology may be used to judge the degree of human aging and help people find ways to delay aging. But it will take 5 to 10 years for this technology to be applied in clinic.
The research team led by Stanford University analyzed the plasma samples of 4263 people, aged between 18 and 95. The results showed that the content of some protein in plasma changed obviously with the increase of age. The researchers measured the levels of about 3,000 kinds of protein, and selected 373 kinds of protein which can be used to judge the age.
The researchers said that by measuring the levels of these 373 protein in plasma, a person's actual age can be judged more accurately, and the error is usually within 3 years. But sometimes the measured age is quite different from the actual age. If the measured age is much lower than the actual age, it means that the subject is very healthy.
Wise-Corey said that although there are 373 kinds of protein to be tested, only one drop of blood is enough, and with the help of machine learning technology, it is expected that only nine kinds of protein will be tested in the future to accurately judge the age.
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