Definitive diagnosis of proximal RTA is accomplished by the demonstration of a low urine pH at low plasma HCO 3 concentration and by the presence of a normal urine P co 2 and a high urine HCO 3 excretion at normal plasma HCO 3 concentration clomids.icu - clomid vs hcg Histopathological diagnoses of tumor biopsy specimens were made by a board certified veterinary pathologist E