We determined the F.A. Overall, thermostable and thermolabile in 100 apparently healthy subjects, 80 men and 20 women between 18 and 50. It was found for F. A. overall average of 7.4 + - 2.45 and 2.2 and 14.2 ends UKA Thermostable fraction for an average of 0.87 + - 0.46 and 0.071 and 3.8 ends UKA.