I've said this before, and I'll say it again.
If you have *ever*, at any time, made a declaration to a physician/hospital that you are a JW and you do not want to receive blood transfusions, and you now wish to rescind that declaration, you need to follow-up with them and very clearly state that you no longer subscribe to these beliefs and that you will accept a blood transfusion if deemed medically necessary.
This may mean going to the hospital registration desk and having your patient information revised to DELETE any indicator of religious affiliation as a JW. I have personal knowledge of JW Elders™ using their Pastoral Care Team privileges to routinely obtain a print-out of all JW patients admitted to the hospital. They pay a visit to each individual on the list (Counting their Time™, naturally) showing up unannounced and uninvited to patient rooms to check on each JW patient, even when a Pastoral Care Visit was declined in writing.
If there is any chance that you will be hospitalized for elective surgery, and you end up accepting a blood transfusion while your JW status is still active in your patient demographics, you could be Unfortunate™ enough to have a surprise visit from an Elder™ who is not even anyone you know personally, while your transfusion is infusing.
You also want to appoint a Power Of Attorney for Health Care Decisions or have a binding legal document in your patient chart expressing your wishes to accept medically necessary blood transfusions, so that "helpful" JW relatives cannot override your wishes while you are unconscious.