Nicholas
                    
                    
                    
                    
                    
                    
                    
                        
                        
                        I need help regarding these three questions. Any help appreciated.    1. What are the test employ to determine whether a person is suffering from diabetes insipidus?  2. How do the test work and how do I perform the test?  3. Is serum and urine osmolality part of the test? How do you judge the result of the analysis?    Thank you in advance.