Forekomst af trombose er yderst sjældent rapporteret i andre blodkar, f. eks. lever -, mesenterie -, nyre -, cerebrale eller retinale vener og arterier hos brugere af oral kombinationsprævention (COC).
Extremely rarely, thrombosis has been reported to occur in other blood vessels e. g., hepatic, mesenteric, renal, cerebral or retinal veins and arteries, in COC users.