Inclusion Criteria:  Females age 8-18yrs seen in the ED at CCMC who are undergoing a trans-abdominal pelvic ultrasound to assess for ovarian torsion Ability of patient (if 18yrs) or parent/legal guardian to sign a written informed consent  Exclusion Criteria:  History of renal, genitourinary, or pelvic anomalies  a. Eg: Chronic kidney disease, anuria, vesicoureteral reflux, ureteral obstruction, urologic reconstructive surgery, suprapubic or pelvic surgery, indwelling urethral catheter, oophorectomy, bicornate uterus  Patients with multiple chronic illnesses or systemic neurologic abnormality  a. Eg: Bronchopulmonary dysplasia, tracheostomy, gastrostomy tube dependence, cerebral palsy, severe developmental delay, mitochondrial disorder, congenital heart disease, cardiomyopathy, chronic kidney disease, diabetes  Patients with known pregnancy  Patients deemed to be critically ill  a. Mental status changes, signs of end organ damage, hypotension  Contraindication to giving Furosemide  a. Allergy to sulfonamide medications, severe dehydration, hypotension, underlying electrolyte abnormality, underlying renal disease  History of previous diuretic use within the past year Patients who self-report their bladder as being full at the time of enrollment