What are the laboratory tests that can be performed to diagnose Abdomen Acute Syndrome in horses?

The hematocrit and total plasma protein levels should be evaluated, taking into account the degree of dehydration of the animal.
An increase in hematocrit with a decrease in total proteins may indicate protein loss in the intestinal lumen or peritoneal cavity.
The analysis of peritoneal fluid obtained by abdominal paracentesis can provide evidence of abscesses, adenitis, lymphosarcoma, and other intrabdominal neoplasms.
The pH of the peritoneal fluid can indicate whether the content is stomach or intestinal.