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In brief: Water. Free fluid is typically water. The lining of your abdominal contents are slippery (your bowel, the lining of your organs) and it's thus wet inside your abdomen. It's normal to have a little free fluid in one's pelvis, as that's where fluid tends to pool.
An ultrasound scan showed free fluid in the perihepatic and perisplenic recesses, but no free air or air-fluid levels were seen on conventional radiographs. It screens four areas for blood collections, namely the perisplenic, perihepatic, pelvis and pericardium (the 4 Ps). Hyperechoic lesions, isolated splenomegaly, perisplenic abscess, and hepatic lesions can also be detected during abdominal ultrasound examination of splenomegaly.