Children with calcium and zinc deficiencies need to have a blood test to quickly find out how much calcium and zinc are in their blood, and to determine visually whether calcium and zinc are within normal limits. Calcium and zinc are both essential elements in human development. Calcium deficiency in children can cause slow growth, waking up easily, irritability and other symptoms. Taking a blood test for calcium is the easiest and most affordable way to visualize whether a child is deficient in calcium. In addition, bone mineral density and bone-derived alkaline phosphatase can also be used to determine whether a child is deficient in calcium. Zinc deficiency in children can have symptoms such as backward development, short stature, hair loss, etc. Clinically, trace elements can be measured to determine whether there is a zinc deficiency. Blood tests for zinc are more intuitive and accurate. If you suspect an elemental deficiency, you should go to the hospital in time and take reasonable tests under the doctor’s advice.