A ferritin of 6.8ng/ml can be oxygenated. Ferritin is the form of iron stored in the body, the normal value range is: male 30~521ng/ml; female 13~269ng/ml. 6.8ng/ml ferritin is significantly lower than the lower limit of the normal value, suggesting that there is a serious deficiency of iron in the body, which is commonly found in patients with iron deficiency anemia. In anemia, hemoglobin decreases, so the amount of oxygen bound by hemoglobin in the body decreases, and some patients may have dizziness, chest tightness and other hypoxic manifestations, and at this time, low-flow oxygen inhalation can be given to help improve the patient’s symptoms. However, oxygen inhalation can not make patients get fundamental treatment, patients need to go to the hematology department in time to improve the electronic gastroscopy, colonoscopy, bone marrow aspiration and other related examinations to clarify the causes of ferritin reduction, and to target the cause of the cause of the treatment, and actively eliminate the cause of the disease and to be supplemented with iron therapy.