Final answer:
Elevated phosphorus levels often parallel hypocalcemia, or abnormally low blood levels of calcium, due to reduced phosphate excretion and decreased serum calcium concentration.
Step-by-step explanation:
Elevated phosphorus levels often parallel hypocalcemia, which is an abnormally low blood level of calcium. In cases where phosphorus levels are elevated, the imbalance is typically associated with reduced phosphate excretion and a decrease in serum calcium concentration. The reciprocal relationship between the concentration of calcium and phosphate ions in plasma is disrupted, causing a fall in serum calcium concentration.