Observation, that is, in-hospital observation, usually refers to the observation measures taken by doctors on the physical condition of patients when their condition is unstable.
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Outpatient observation refers to a kind of doctor's advice in hospital outpatient service. Outpatient service is mainly for patients with mild illness and does not need hospitalization, so the so-called outpatient observation is a kind of "minor illness and disaster", such as infusion, injection, etc., which is a medicine prescribed for patients to prevent drug reactions. Outpatient observation generally does not exceed 1 hour.
Emergency observation refers to a kind of doctor's advice in the emergency department of a hospital. The emergency department mainly carries out emergency treatment and rescue. Generally, patients are seriously ill and have higher requirements for medical staff. After major medical actions (such as surgery), accidents and even deaths are more likely than outpatient services. Therefore, emergency observation is the final guarantee to confirm the success of medical action. If the medical action fails, it is found in the observation that the medical staff can give treatment in time and learn some lessons from it.