The content of S100b protein, HLDF24 peptide, and autoantibodies to these factors in blood serum was measured in healthy individuals (35-64-year-old men and women) with various levels of "normal" BP. Significant differences in the amount of these molecular factors were found in individuals with various categories of BP. We revealed age-related and gender differences in the content of molecular factors in the serum. Our results indicate that variations in the concentration of S100b, HLDF24, and autoantibodies to these factors in blood serum from adult people can serve as a reliable criterion for the risk of arterial hypertension.