Is the "sub-health test" of medical institutions credible?

I took part in the physical examination organized by the company a few days ago. As in previous years, there is a "sub-health test" in the physical examination. I believe many people have done it, that is, put your palm on a device with two disks on it, and the doctor clicked several buttons on the computer. The results came out in about ten seconds, and the results were "fatigue" and "normal". Following the doctor's advice, I made a "special health examination" at my own expense. The test site is in the same place as the "sub-health test" above, but this time it is analyzed by cutting my hair. The doctor cut some of my hair and put it in a bottle. I can come back to see the results in ten minutes. Ten minutes later, I went back, and two detailed Health Early Warning Detection and Analysis Reports were placed in front of me. One lists the detection of trace elements in my body, and the other lists the health status of my various systems. According to the test report, the doctor carefully explained to me what nutrition I lack, how to supplement it, the difference between my system indicators and normal values, the possible reasons and the adjustments I need to make in my life, such as paying attention to sleep, strengthening exercise and keeping a good mood. I listened to these reports with a grain of salt myself, because some places seem quite accurate and some places seem unreliable. I have a few questions: 1.2. Can you really quickly detect your health through your hair? 3. If the so-called "sub-health test" of many medical institutions is not credible, then medical institutions also publicize and recommend this test. Is it suspected of fraud? I hope that a friend who knows this situation can help me answer it.