Review Question - QID 211020

A 49-year-old woman presents with 2 weeks of urinary incontinence. She first noticed some light, urinary dribbling that would increase with sneezing or coughing. This dribble soon worsened, soaking through a pad every 3 hours. She denies any fevers, chills, abdominal pain, hematuria, dysuria, abnormal vaginal discharge, or increased urinary frequency. The patient had a bilateral tubal ligation 3 weeks ago. Her last menstrual period was 2 weeks ago. Her menses are regular and last 5 days. She has had 3 pregnancies that each resulted in uncomplicated, term vaginal deliveries. Her last pregnancy was 2 years ago. The patient has hypothyroidism and takes daily levothyroxine. She denies tobacco, alcohol, or illicit drug use. She has no history of sexually transmitted diseases. She is sexually active with her husband of 25 years. Her temperature is 98.7°F (37°C), blood pressure is 112/72 mmHg, pulse is 73/min, respirations are 12/min, and oxygen saturation is 98% on room air. Her BMI is 26 kg/m^2. On physical examination, the abdomen is soft, nondistended, and nontender without palpable masses or hepatosplenomegaly. Rectal tone is normal. The uterus is anteverted, mobile, and non-tender. There are no adnexal masses. Urine is seen pooling in the vaginal vault. Urinalysis is unremarkable. Which of the following is the most appropriate next step in diagnosis?