Question 1

Purpose of the Evaluation

Accepted Answer

Differentiate between Central and Nephrogenic Diabetes Insipidus. Distinguish Polyuria-Polydipsia syndrome from Primary Polydipsia. Assess the pituitary gland's ability to secrete Antidiuretic Hormone (ADH).

Question 2

When to Perform This Test

Accepted Answer

Unexplained excessive thirst despite high fluid intake. Frequent and excessive urination (large volumes). Persistent nocturia (waking up at night to urinate). Suspicion of posterior pituitary dysfunction.

Question 3

Interpreting Results

Accepted Answer

Low Copeptin levels typically suggest Central Diabetes Insipidus. High Copeptin levels relative to osmolality may indicate Nephrogenic Diabetes Insipidus. Normal levels help confirm Primary Polydipsia (psychogenic thirst).

Solve Persistent Excessive Thirst Issues - Diabetes Insipidus Evaluation (Copeptin & Osmolality)