A client with multiple myeloma presents to the emergency department and reports excessive thirst and constipation. Family members report that the client has been confused for the last day. Which laboratory value is most likely responsible for this client's symptoms?

Hypercalcemia

Explanation:

When bone fractures that commonly occur in multiple myeloma patients cause by lesions on bone. The bone de-fragmentation causes hypercalcemia due to excessive breakdown the levels of calcium increase continuously in blood. This causes excessive thirst in patients also with mental confusions due to accumulation and disturbance with neo-plasmic cells of blood.