Blood Tests
Many blood tests can help diagnose polyuria. Fasting blood glucose is a common option to look for the presence of diabetes mellitus. The doctor might also need to measure serum electrolytes. Any abnormalities in the levels of potassium and calcium can indicate chronic kidney disease. If he or she suspects that your polyuria symptoms are caused by medication side effects, then a blood test can measure lithium levels to rule out the cause. Another option is the erythrocyte sedimentation rate. If the result is higher than usual, it can be a possible symptom. Lastly, the complete blood count assesses the overall health to find out potential causes of polyuria. [12]
