How long should I leave after having my vitamin B12 injection before an intrinsic factor antibodies test? Sam Rodgers 13 July 2020 11:51 We recommend that you leave two weeks between your vitamin B12 injection and an intrinsic factor antibodies test. Related articles Should I take my test whilst I have coronavirus? How do I activate my kit? I take thyroid medication. Should I stop before taking my test? Do I need to fast for a cholesterol (lipids) test? Venous collection information Comments 0 comments Article is closed for comments.
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