A normal person should have a pale yellow color with urine ketone test paper, which means no ketone body. If the test paper of urine ketone body gradually becomes purple and dark purple during the test, it represents the gradual increase of ketone body, which can be expressed by (+), (++), (++++), (++++), the darker the color, the more the plus sign, which indicates the gradual increase of fat decomposition metabolism of the body. The test requires holding the terminal of the test strip, completely submerging the test strip in the urine sample for 1-2 seconds, removing the test strip and then removing the excess urine with absorbent paper, comparing it with the colorimetric card after 1-2 minutes and reading the result. A normal person’s urine ketone body should be negative. If it appears positive, it means that glucose cannot provide the body with normal energy, and then the body needs energy to be replaced by the liver breaking down fat, and the main product of fat breakdown is ketone bodies. If the fat decomposition is too much and exceeds the compensatory capacity of the liver, ketoacidosis may occur, which is common in abnormal glucose metabolism and starvation ketosis. 1. Abnormal glucose metabolism: mainly seen in diabetic patients, the absolute or relative secretion of insulin is insufficient in diabetic patients, and the glucose metabolism is impaired, so that glucose cannot enter the cells normally for metabolism to provide energy, and then fat begins to decompose and too much fat is produced. Ketone bodies appear, and the accumulation of excessive ketone bodies causes acidosis; 2. Starvation ketosis: For example, patients eat too little, and some pregnant women vomit obviously, or patients with eosinophilia cannot eat, but the body needs energy, so it needs to break down fat, which in turn leads to ketoacidosis. Therefore, when patients have positive urine ketone bodies, they should be further checked whether it is due to abnormal glucose metabolism or due to starvation ketosis, and they should be differentiated because the two conditions have completely different treatment plans.