<prompt> Answer this question truthfullyWhat is the diagnostic criterion for spontaneous bacterial peritonitis, and what is the procedure used to diagnose it?  <response>: <reason> The diagnostic criterion for spontaneous bacterial peritonitis is an ascitic fluid absolute neutrophil count 250 cellsmm3. The procedure used to diagnose this condition is paracentesis, which involves the removal of a small amount of fluid from the abdominal cavity for laboratory analysis. 