What are reasons for possible abnormal results of a pericardiocentesis?

Varies: Pericardiocentesis is a technique where a sample of pericardial fluid is removed from the sack around the heart. The fluid can be abnormal if its an infection with bacteria or fungi . Cultures would be performed to asses this. If the examination of the cells are abnormal cancer may be the cause. Other causes of autoimmune diseases can be found as well.

Several: Common diagnosis are renal failure, heart failure, infection, and cancer.