Please correct me if I am wrong. According to what I read, both cyrsupernatant and cryoprecipitate are a conscience matter. So they are only condemning the outer membrane?
There is no membrane in Plasma (you may be thinking of Hemoglobin, which is the inner part of the red blood cell removed from the Membrane, and then sythesized to make it safe to put in the bloodstream). It's like peeling an orange, throwing away the peel, and then caramelizing it for a nice snack (and then saying that you abstain from oranges)).
Plasma is mostly water with lots of "stuff" in it. Cryoprecipitate is the a collection of fractions (Factor VII, fibrinogen, vWF, and factor XIII) removed from the plasma. The remaining "stuff" is called the Cryosupernatant.
Recombine these, and you have plasma again.
All the "major blood fractions" float around in the water that makes up the majority of "plasma". It just so happens that if you take blood, add an anticoagulant, and then spin it really hard, the white and red blood cells will "naturally" seperate. This is used as justification for the "major" fractions (although the disallowed major fraction, platelets, still remain suspended in the plasma).
Interestingly, some of the allowed "minor fractions" of plasma, make up a greater percentage of the blood than the disallowed blood cells.
One reason fractions are allowed is because of scientific evidence that certain plasma "fractions" are passed from fetus to mother during pregnancy. Strangely, although white blood cells are passed from mother to baby in breast milk, they are not allowed.
It's a bloody mess.