Guide to Diagnostic TestsSearch Guide to Diagnostic TestsABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZUCa (urine calcium)UFH (unfractionated heparin)UGI (upper GI study)UGT 1A1 (uridine diphosphoglucoronosyl-transferase) variantsUNa (urine sodium)Unfractionated heparinUPEP (urine protein electrophoresis)Upper airway infectionsUrea breath testsUremiaUrethritisUric acidUricaseUrineUS (ultrasound)Uterine cancerUTI (urinary tract infection)U waves