Ubiquitin by Immunohistochemistry UDP Glucuronosyltransferase 1A1 (UGT1A1) Genotyping Ulex Europaeus Agglutinin 1 (UEA-1) by Immunohistochemistry Unusual Organism Culture Urea Clearance Urea Nitrogen, Fluid Urea Nitrogen, Serum or Plasma Urea Nitrogen, Urine Ureaplasma Species and Mycoplasma hominis Culture Uric Acid, Body Fluid Uric Acid, Serum or Plasma Uric Acid, Urine UroVysion FISH Urticaria-Induced Basophil Activation Urticaria-Inducing Activity Urticaria-Inducing Activity with Thyroid Antibodies and Stimulating Hormone Urinalysis, Complete Urinalysis, Complete with Reflex to Culture Urine Culture Urogenital Ureaplasma and Mycoplasma Species by PCR