Final answer:
The initial treatment for mild hypercalcemia, with serum calcium levels between 10.3-12.9 mg/dL, should focus on hydration. Diuretics, hemodialysis, or bisphosphonates are not the first-line treatment options. Proper calcium homeostasis is critical for normal body functions.
Step-by-step explanation:
Mild hypercalcemia is defined as a total serum calcium level between 10.3-12.9 mg/dL. Managing this condition initially should focus on hydration to help dilute the blood calcium levels and increase its excretion. Diuretics like furosemide are generally avoided as a first-line treatment due to the potential for causing further calcium elevation. Hemodialysis is a treatment reserved for severe cases or when the patient has renal failure. Bisphosphonates are typically used in cases of prolonged hypercalcemia or in association with malignancy-related hypercalcemia due to their effect on slowing down bone resorption. Therefore, the second option hydration is the appropriate initial treatment for mild hypercalcemia. An understanding of calcium homeostasis is essential, as hypercalcemia can lead to serious multi-systemic effects, including lethargy, constipation, and in severe instances, coma.