The etiopathogenesis of HG is still unclear.The aim of this study was to investigate the levels of YKL-40 protein as an inflammatory marker and evaluate the levels of IMA as an oxidative marker in hyperemesis gravidarum women.Totally 35 patients with hyperemesis gravidarum and 35 healthy pregnants were included in the study. Singleton pregnancies between 6+0 week and 13+6 weeks of gestation, with normal fetal anatomy were included in the study. Complete blood count, complete urine analyze, biochemical tests and thyroid function tests were done.There was no significant difference between groups for demographical features (age, gravidity, gestational age, body mass index). Also, there was no statistically significant difference between groups for IMA levels (p>0.05). The median level of YKL-40 was higher in pregnants with hyperemesis gravidarum than normal pregnants but the difference was not statistically significance (p>0.05).Further comprehensive studies with more number of patients are needed to show the efficacy of YKL-40 and IMA levels for predicting hyperemesis gravidarum and even monitoring of the treatment.