It takes two weeks at the latest to completely rule out internal injuries in car accidents. According to current clinical experience, internal injuries caused by car accidents are clinically referred to as closed abdominal injuries, and closed abdominal injuries present with organ injuries, which can include injuries to both substantial organs and cavities, with the cavities mainly being the intestinal tracts, which will present with early symptoms of peritonitis after rupture. The alert is substantial organ injury, especially liver and spleen rupture, if there is no true rupture, but pseudo-rupture, that is, the pericardial line is intact, just appearing in the liver, spleen or subperitoneal hematoma, according to the clinical experience, at the latest, true rupture, bleeding, or even hemorrhagic shock can occur within two weeks. So based on current clinical experience, closed abdominal injuries caused by car accidents can have delayed rupture and bleeding within two weeks at the latest.