Bone Alkaline Phosphatase (BAP) is a critical value of 200, which is considered normal, but should be taken seriously and should be reviewed every 2-3 months to prevent a gradual increase. Once this blood test exceeds 300, it is highly suggestive of a tendency to rickets, and even if it exceeds 200 and reaches 250, preventive measures such as oral vitamin D and calcium preparations should be actively taken. Elevated bone alkaline phosphatase indicates a deficiency in mineral deposition in the human skeleton, especially if the value of bone alkaline phosphatase exceeds 300, indicating a serious deficiency in mineral deposition in the human body. This blood test is a good way to diagnose rickets in children at an early stage, so that symptomatic treatment can be taken in time to prevent more serious consequences.