Final answer:
Polyuria, polydipsia, hyperNa, hyperOsm, and dilute urine can be indicative of diabetes insipidus. Urine osmolality can be used to diagnose the type of diabetes insipidus.
Step-by-step explanation:
Polyuria is the condition of excessive urine production, while polydipsia refers to increased thirst. Hypernatremia (hyperNa) and hyperosmolarity (hyperOsm) are elevated levels of sodium and osmolarity in the blood, respectively. Dilute urine indicates low concentration of waste products in the urine.
If urine osmolality still decreases after water deprivation, it suggests the presence of diabetes insipidus. On the other hand, if urine osmolality increases with the administration of DDAVP (desmopressin), it indicates the presence of central diabetes insipidus.