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The normal calcium level range in the blood is typically between 8.5 and 10.5 mg/dL. This range is critical for various physiological processes, including bone health, muscle function, nerve transmission, and blood clotting. Maintaining calcium levels within this range is essential for overall health, as both low and high calcium levels can lead to significant health issues.

When calcium levels fall below 8.5 mg/dL, it can result in symptoms such as muscle cramps, numbness, and tingling, indicating hypocalcemia. Conversely, levels above 10.5 mg/dL can lead to hypercalcemia, which may cause symptoms such as nausea, vomiting, kidney stones, and confusion.

This understanding underscores the importance of monitoring calcium levels for maintaining homeostasis and preventing complications that may arise from imbalances. The other range options provided do not accurately reflect the current consensus for normal serum calcium levels, making this range the appropriate choice.