Final answer:
Hyperkalemia can be diagnosed through a comprehensive history, physical examination, and laboratory tests, including measuring the potassium level in the blood and an electrocardiogram (ECG).
Step-by-step explanation:
Hyperkalemia, an elevated potassium blood level, can be diagnosed through a comprehensive history, physical examination, and laboratory tests. These tests may include measuring the potassium level in the blood, urine analysis, and an electrocardiogram (ECG). In addition, a review of the patient's medical history, including any medications they are taking, can also help in diagnosing hyperkalemia. Assessing dietary potassium intake and reviewing the family medical history are not direct methods of diagnosing hyperkalemia.