Many patients, when consulting me, will find that I often ask for a laboratory indicator – C-reactive protein, which I have also mentioned in a previous article “Do you need an infusion”, but what exactly is the significance of this indicator? Even some doctors may not be very clear, at present the abuse of antibiotics in our country is very common, one of the important factors is the lack of good specific clinical performance, so we very much need to have some objective indicators to help us decide whether to choose antibiotics and what level of antibiotics to choose. So C-reactive protein is the most cost-effective indicator available, well, let’s unveil this indicator and see its true face.