Which medication is likely to be prescribed for a client showing signs of calcium depletion after a thyroidectomy?

The correct choice is calcium, as this medication directly addresses the issue of calcium depletion that can occur following a thyroidectomy. During this surgical procedure, the parathyroid glands, which regulate calcium levels in the body, can be inadvertently damaged or removed. This can lead to hypocalcemia, or low levels of calcium in the blood, resulting in various clinical manifestations such as muscle spasms, tingling, or even cardiac complications.

Supplementation with calcium is essential for restoring normal serum calcium levels. Calcium supplementation can help alleviate symptoms and prevent complications associated with hypocalcemia. Appropriate forms of calcium supplementation may include calcium carbonate or calcium citrate, depending on the patient's specific needs and gastrointestinal tolerance.

The other options do not directly address calcium depletion. Magnesium is important for many metabolic processes and can play a role in parathyroid function but does not substitute for calcium. Bicarbonate is primarily used in managing metabolic acidosis and is not relevant as a treatment for calcium levels. Potassium chloride is used for managing hypokalemia and has no connection to calcium depletion. Thus, prescribing calcium is the most logical and effective choice in this context.