Fisherman,
The position of Jehovah's Witnesses, stated in multiple publications is that, "People of all nations were bound by the requirement at Genesis 9:3, 4, but those under the Law were held by God to a higher standard..."
The position of Jehovah's Witnesses, stated in even more publications is that the Apostolic Decree was, "...based on the Bible record concerning events that predated the Law. So there was not an imposing on Gentile Christians of a responsibility to conform to the Mosaic Law or some portion of it but, rather, there was a confirming of standards recognized prior to Moses."
The abstention of blood in the Decree was therefore not a reiteration of the strict requirements of the Law. It was (According to the JW parent organization) a reiteration of the simpler Noahide requirement.
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Even strictly within the context of the Law, there is no
prohibition on the storage of blood. The ceremonial uses of blood
mandated in the Law actually required the storage of blood and
there were pitchers and bowls among the temple accoutrements for that
purpose which are described in Deuteronomy.
The idea that blood cannot be "used" comes from the Oral Law and Chumash sources, which Jehovah's Witnesses do not accept. -More specifically, you could not profit from the use of blood in any way, which is not quite the same thing, but is pretty close when it comes to using animal blood as an ink, dye, stain, paint, gelling agent, etc.
Throughout all of this, Jehovah's Witnesses steadfastly ignore the fact that blood had a "use" long before the fall of Man and the need for a Redeemer ever arose. All of us "use" blood in this sense, which is what transfusion is all about. It is a use of blood in accordance with its design purpose and not comparable to anything you can find in the Bible.
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You've reiterated a flawed argument that the Jehovah's Witnesses abandoned in the late 1960's, which is that, ..."the
recipient of a BT "consumes" blood by using it inside his body and in time
absorbing it."
Hemoglobin, through a series of enzyme reactions is
converted into unconjugated bilirubin which gives excreta (i.e. bile and stool) their
characteristic colors and is the polar opposite of absorption.
The one single component of blood that actually can provide a nutritional benefit when transfused is serum albumin. We have much better and more cost-effective solutions today, but it was used in post-war Japan for example to bring people back from the brink of starvation when they were too weak to eat. Serum albumin, even when administered as a transfusion to burn patients has been allowed under JW policy for decades now, so that secondary benefit is of no consequence and the JW parent organization does not make that argument today.