Pregnancy ketone body 3 + refers to the urine ketone body content positive, + is often used to indicate the degree of severity, 3 + often suggests that the content is more, positive can be seen in a variety of diseases. Positive urine ketone body often suggests that the patient’s body sugar metabolism is abnormal or insufficient sugar supply, fat mobilization, which produces excessive ketone bodies leading to excessive ketone bodies in the patient’s body and urine ketone body positive, such as ketones in the patient’s body or even ketoacidosis may occur and endanger the patient’s life. Pregnant women appear urine ketone body 3 + positive can be seen in some diseases, such as early pregnancy reaction, the patient nausea and vomiting can not eat, the body sugar supply is insufficient, there is a large number of fat mobilization, resulting in urine ketone body positive; gestational diabetes or diabetes mellitus combined with pregnancy, there will be an abnormal metabolism of glucose, which leads to ketone body is too high. Patients with 3+ ketone bodies in urine are advised to seek prompt medical attention and treatment as prescribed by the doctor.