Diagnosis of heart failure cannot be made by symptoms alone because many disorders share the same symptoms. The most specific and sensitive diagnostic test for heart failure is: Complete blood count, blood urea nitrogen, and serum electrolytes that facilitate staging for endorgan damage. Chest x-rays that show cephalization and measure heart size. Correct! Two-dimensional echocardiograms that identify structural anomalies and cardiac dysfunction. Measurement of brain natriuretic peptide to...