(This will be a pratical scientific writing, so please be critical about it)

The diognosis in modern clinic is more based on lab results, other than personal experience of doctors. Imagine you get headache and go to an appointment in hospital. The doctor probabliy can't tell you anything until several tests are performed. In most cases, what you will get from the initial visit is a long list of lab you need to make appointments, e.g., blood test and CT. Acutally, your health condition will become quantative after these tests. For example, the blood test shows your cholesterol level is 10% above the normal values. Some other labs become quantative with the help of specialists. For example, a radiologist will give a negative report (nothing positive or susceptible) based on your CT images. Every result is then gethered by your primary doctor, who can provide you a final conclusion of your problem. How does he do that? base on his 20 years experience to figure out your special situation? Maybe yes. But in most situation, the diagnosis has already been decided when the abnormal term was listed on the lab results. A interesting question, therefore, is rised here: what is the role of doctor in clincal diagnosis?