Is there utility in obtaining pericardial fluid autoimmune labs such as ANA or RF in patients with recurrent idiopathic pericardial effusions, but no other clinical or serologic evidence of rheumatic disease?

There seems not to be a consensus literature on this topic, so my answer is based on common sense rather than science. The first step is a detailed history (including family history) and physical examination looking for evidence of inflammatory joint disease with/without other findings that might fo...