Vitamin testing is done through intravenous blood draw, without fasting, and can be done at any time in the hospital, as deficiencies of body elements cause a variety of abnormalities in the body. This can be determined by your own condition, such as increased hair loss, rough, dull, lusterless skin, numbness in the hands and feet, weakness and fatigue, and dry eyes, which are signs of vitamin deficiency. There are many kinds of vitamins, and it is necessary to go to the hospital in time to draw blood in order to determine which kinds of vitamins are lacking, and then targeted supplementation, check the trace elements sodium, calcium, magnesium plasma, can also be detected by drawing blood. Mass spectrometry is a new test method introduced in recent years, using the test method can be measured at the same time a variety of vitamins, is currently the more clinically used test method, up to 9 kinds of vitamin content in the body can be measured at the same time to determine whether the lack of.