The correct interpretation of the layout of fetal monitoring is a challenge for current clinical; recently a diagnostic methodology based on the theories of probability and entropy, which managed to assess in an objective and reproducible way the layout of differentiating normal fetal monitoring and evolution of disease between these states was developed. The aim of this paper is to apply this methodology to assess fetal monitoring tracing and confirm their clinical applicability and reproducibility. For this 25 fetal monitoring in 20 minutes divided into two groups were evaluated: 10 normal and 15 with loss of fetal well-being, according to the conventional interpretation of the monitoring, and general clinical evaluation. Heart rates presented in discrete time intervals from the paths they took, and the likelihood and the S/k ratio of entropy was evaluated. The S/k relations of entropy for normal differentiated evaluated by monitors disease. The clinical applicability of physical and mathematical diagnostic assessment of fetal monitoring tracing was confirmed.