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Holotranscobalamin will be automatically added if serum Total B12 is <270 pmol/L. If the serum Total B12 is >270 pmol/L, Holotranscobalamin will only be performed if specifically requested.
Please note that heparinised plasma IS NOT SUITABLE for this test. The only sample type which can be used is serum.
38-188 pmol/L
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