Describe frequent cardiotocography morphologies of cases with perinatal asphyxia (PNA) between 2018-2021. A retrospective, multicentric, descriptive study was conducted using a previously generated database. RedCap database included PNA cases from 2018-2021 from two healthcare institutions in Bogotá, Colombia. Inclusion criteria: pregnancy >32 weeks, cardiotocography (CTG) within three hours prior to delivery with at least 20 minutes of continuous tracing. Twin pregnancies, stillborn fetuses and unsatisfactory CTG tracings were excluded. PNA diagnosis: 10 minutes Apgar ≤ 5, pH ≤ 7.0 or base deficit ≥ 12 mMol/L in umbilical cord blood sample. Variables were based on adaptive changes to hypoxia: variability, baseline, absence of accelerations, late/variable decelerations, slow response decelerations (prolonged 2-10 min, >45° fall/recovery angle) and shallow recurrent decelerations. CTGs interpretation was performed by consensus of the research team. 32 PNA cases were included. 84% had identifiable adaptive changes to hypoxia (table 1). 60% of late/variable decelerations showed slow response morphologies. 25% of CTGs with absent/decreased variability showed late/variable decelerations. Most CTGs had identifiable patterns according to defined variables. The most common morphology was a flat not responsive pattern, interestingly, in this group late/variable deceleration frequency was low. A high proportion of CTG morphologies showed patterns not included in tools commonly used in clinical setting.