Introduction: Holotranscobalamin contains biologically available cobalamin because only holotranscobalamin promotes the uptake of the cobalamin therein by all cells, via specific receptors. Therefore holotranscobalamin has been proposed as a potentially useful alternative indicator of vitamin B12 status. The aim of the present study was to assess usefulness of holotranscobalamin in the evaluation of vitamin B12 status.
Material And Methods: We examined serum level of holotranscobalamin in 135 subjects divided in four groups according to the serum concentration of vitamin B12: 30 subjects with vitamin B12 <154 pmol/l, 50 subjects with vitamin B12 154-250, 30 subjects with vitamin B12 2251-350 pmol/l, 25 subjects with vitamin B12 >350 pmol/l.
Results: The results show that in subjects with low vitamin B12 serum level there are those with normal holotranscobalamin concentration (60%) and that in subjects with normal vitamin B12 there are those with low holotranscobalamin concentration (22%). The obtained results also show positive significant correlation between levels of holotranscobalamin and vitamin B12 (r = 0.62, p < -0.001).
Conclusion: We can conclude that biologically active cobalamin, holotranscobalamin, is a useful tool when examining vitamin B12 status especially in subjects with borderline and low vitamin B12 concentrations. Measurements of the serum holotranscobalamin may be superior to total serum cobalamin.
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