Best performed with full bladder to provide good window to view posterior structures and to move bowel gas out of view, however make sure to not confuse bladder with other cystic structures that may be present (ie. large ovarian cyst)
Free<unk>  fluid with positive hCG is ectopic pregnancy until proven otherwise
Presence of doppler flow cannot rule out ovarian torsion
Pelvic ultrasound 
Bladder ultrasound
Ultrasound 
Musculoskeletal ultrasound
FAST exam
Emergency contraception
Renal ultrasound
Urine analysis