A 52-year-old man complains of impotence. On physical examination, he has an elevated jugular venous pressure, S3 gallop, and hepatomegaly. He also appears tanned, with pigmentation along joint folds. His left knee is swollen and tender. The plasma glucose is 250 mg/dL, and liver enzymes are elevated. What is the best next step to establish the diagnosis?

Immediately perform an anamnesis, magnetic resonance imaging, computed tomography, and more rigorous laboratory analysis such as the evaluation of glycated hemoglobin, RIN, KPTT, and complete coagulogram in order to determine the state of coagulation if an emergency surgical act.

Explanation:

All the studies named plus those written in the question are those that determine the certainty diagnosis, not the presumptive one.