<prompt> When does the cardiac output returns to pre pregnancy state?4 hours4 weeks6 week8 week  <response>: ANSWER: B 4 weeksREF: Duttas obs 6th edp. 53Cardiac output in pregnancy:Starts to increase from 5th week of pregnancy, reaches its peak to 40-50 of baseline at about 30-34 weekCO is highest in right or left lateral or knee chest position and lowest in supine or sitting positionCardiac output is higest post delivery.Return to pre labour values by 1 hour and pre-pregnant levels by 4th week. 