The diagnostic criteria of malnutrition are as follows: 1, the level of albumin in the blood to determine the standard of malnutrition, if the level of albumin in the blood between 28-35g/L, can be diagnosed as mild malnutrition. If the albumin level in the blood is between 22-28g/L, it can be considered as moderate malnutrition. If the albumin level in the blood drops to 22g/L, it should be considered as severe malnutrition. 2. You can judge by weight, if the weight drops to 60%-90% of normal weight, it should be considered as moderate malnutrition. If it is between 90% and 100%, it is mild malnutrition. If it drops below 60% of normal weight, it is considered severe malnutrition.