What hormonal deficiency causes diabetes insipidus in a client?

Diabetes insipidus is primarily caused by a deficiency of antidiuretic hormone (ADH), also known as vasopressin. This hormone plays a crucial role in regulating the body's water balance by acting on the kidneys to promote water reabsorption. When ADH levels are low, the kidneys are unable to concentrate urine effectively, leading to excessive urination (polyuria) and increased thirst (polydipsia).

In the context of diabetes insipidus, the lack of ADH results in a condition where the body cannot retain water, which can lead to dehydration and electrolyte imbalances if fluids are not adequately replaced. It is important to recognize that the other hormonal choices listed do not directly relate to the regulation of water balance in the body, making them unrelated to the development of diabetes insipidus. Understanding the function of ADH is essential in managing conditions involving fluid and electrolyte balance.