Often, when communicating with a patient, doctor can hear the question: "What is the guarantee for your treatment?" An attempt to compare a guarantee in medicine with the usual guarantees that are provided when a consumer buys goods is not entirely correct. The reason is simple - human biology. The reaction of the body, even to the correct treatment, may vary from person to person.
From the point of view of medicine, any treatment has a FORECAST. Prognosis is a statistical measurement of the ratio of successful to unsuccessful treatment, in close connection with the general condition of the body. This is the term that doctors use. Basing on this, doctor issues a guarantee for the treatment result.