Is 6 units of prbc over 20 hours a dangerous amount for a female, 28yo, 5,1 height whose very anemic (hb=4.6) to be given?? thankyou

Unlikely: The normal hemoglobin for an adult female is between 11.5 and 14.0. Yours was down to 4.6. Each unit of blood will raise the hemoglobin around 1.0 gm% of hemoglobin. So six units should get you greater than 10.0. It is not dangerous in amount. I question the rate at which is was given. Most hospitals would have given six units of blood over 24-36 hours. Not 20 hours. But maybe you were bleeding.