Serum Phosphorus test measures the amount of phosphorus in the blood. Phosphorus, an essential mineral, plays a key role in building strong bones and teeth, as well as in how the body uses carbohydrates and fats. It's also involved in the body's production of protein for the growth, maintenance, and repair of cells and tissues. This test helps check for conditions that can alter phosphorus levels, such as kidney disease, bone disorders, and issues with calcium intake. Low or high phosphorus levels can indicate potential health issues, making this test important for monitoring overall mineral balance and bone health.