To evaluate female reproductive organs in pediatric patients or those that are not sexually active or refuse transvaginal exam
For evaluation during later pregnancy
Start with transabdominal ultrasound when evaluating to rule out ectopic (less invasive than transvaginal), particularly if bHCG >6,000
Pelvic ultrasound 
Bladder ultrasound
Ultrasound 
Musculoskeletal ultrasound
FAST exam
Emergency contraception
Renal ultrasound
Urine analysis