<prompt> What is the clinical diagnosis when a pregnant woman presents with bloody vaginal discharge through a closed cervical os during the first 20 weeks?Threatened aboionComplete aboionIncomplete aboionPreterm labor  <response>: The clinical diagnosis of threatened aboion is presumed when bloody vaginal discharge or bleeding appears through a closed cervical os during the first 20 weeks Ref: Williams Obstetrics; 25th edition 