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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.
Ultrasound results meaning. Jenmtr1998. My ultrasound results say anechoic free fluid in the pelvic cul-de-sac and 2 mm tiny cystic area in the region of fundal endometrium. Correlate with pregnancy status.