Obstetrics and Gynaecologymiddle twist
A 31-year-old woman at 18 weeks' gestation presents with sudden left flank pain and microscopic haematuria. She is afebrile, her blood pressure is 126/74 mmHg and her serum creatinine is 71 micromol/L. The pain improves after paracetamol, and there is no vaginal bleeding or fetal concern. Which investigation is the most appropriate initial test for suspected renal colic?