OBJECTIVE To evaluate the significance of umbilical cord chitotriosidase concentrations in pregnancies with mild preeclampsia and explore the relationship between fetal chitotriosidase levels and fetal blood flow velocity. METHOD The study population included control group (n=40) and study group with mild preeclampsia (n=40). Umbilical cord blood samples were collected immediately after delivery. Umbilical artery (UA) flow velocity waveform was determined just before delivery. RESULTS Umbilical cord chitotriosidase levels and UA S/D rate were significantly high in preeclamptic group. CONCLUSION Chitotriosidase may be useful biochemical marker of fetal compromise that reflects the severity of fetoplacental blood flow resistance in pregnancies complicated by preeclampsia.