A finger oximetry of 90 to 94 is abnormal and suggests the presence of hypoxemia and the need for oxygen therapy. Finger oximetry 90 to 94, that is, fingertip percutaneous arterial oxygen saturation of 90% to 94%. When a normal person lives at sea level and breathes air with an oxygen concentration of 20.9%, the fingertip percutaneous arterial oxygen saturation should be 95% and above. When it is 90% to 94%, it suggests that the patient may have varying degrees of hypoxemia. If there is local circulatory obstruction, the measured fingertip percutaneous arterial oxygen saturation does not reflect the true arterial oxygen saturation, and then it is necessary to improve the arterial blood gas analysis, and if the arterial blood gas analysis oxygen saturation is also 90% to 94%, it means that the patient has different degrees of hypoxemia. When hypoxemia occurs, the arterial oxygen saturation can be improved to avoid further aggravation of the condition through oxygen therapy, such as administering oxygen via nasal plug, administering oxygen via oro-nasal mask, administering oxygen via noninvasive ventilator, administering oxygen via high-flow, and administering oxygen via invasive ventilator. Finger oxygen measurement of 90 to 94 is not normal, need timely treatment, need to listen to the doctor’s guidance, follow the doctor’s instructions for treatment.