A 52-year-old male with history of diabetes mellitus, non- coronary cardiomyopathy and sick sinus syndrome is complaining of chronic pain affecting the metacarpophalangeal joints of both hands and his left knee. An x-ray of the knee is shown below (see Figure).


The patient’s family history is remarkable for his father dying from liver cirrhosis in the absence of history of alcohol abuse. What additional testing is indicated at this point?

Remaining Tries: 10