This quantitative exploratory study shows the behavior of antepartum electronic fetal monitoring NST in pregnant women attended at the Daniel Alcides Carrion Hospital at Cerro de Pasco in January and February 2020. Methodology: It is an observational, descriptive, prospective, cross-sectional study in 155 pregnant women. The technique used was cardiotocographic analysis with the FISHER test, and descriptive statistics were used through Microsoft office Excel 2010 spreadsheet. Results: antepartum monitoring elements were presented on average as follows: Baseline 134 beats, variability 10 beats, accelerations and fetal movements 6 and 8 during 30 minutes respectively; most of the tests are in normal conditions, baseline was found from 100 to 160 beats, variability from 4 to 15 beats, a slight decrease in acceleration is observed at higher altitude, movements behaved similarly throughout the altitude. Conclusions: The elements of antepartum fetal monitoring - NST, are within normal parameters, according to the FISHER test, this could be due to the adaptation of the fetal pulmonary vessels, however, there is slight decrease in acceleration at higher altitude, suggestive of high altitude hypoxia; further investigation is recommended.