Dark Red Blood During Blood Draw. It doesnt mean anything since we coomonly see that sometimes it is difficult to take blood samples even in compeltely healthy people. Dark-colored blood called venous blood is dark because it has become deoxygenated after having traveled through the body before returning to the heart drained of oxygen.
Draw a sufficient amount of whole blood into a plain red-top tube or a gold- top serum gel tube. Darkened blood color is often observed in critically ill patients generally because of decreased oxygen saturation but little is known about the other factors responsible for the color intensity. 1 part citrate to 9 parts blood.
This hemolysis invalidates the PCV and affects assessment of red blood cell morphology during blood smear examination.
There is also a situation where fluid buildup in the lung sacs. Phlebitis is inflammation of a vein. 1 part citrate to 9 parts blood. Blood normally drawn from veins is not bright red it is rather dark red or purple in color.
