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Objective: To estimate acetylcholinesterase (AChE), protein thiols (PT), ceruloplasmin (CP) and C-reactive proteins (CRPs) to assess any change in their levels following intrauterine insemination (IUI). Materials and Methods: Forty-two patients aged 31 ± 4.65 years (mean ± SD) with primary infertility selected for IUI. All of them had induced ovulation with clomiphene citrate 50 mg from day 2 to day 6. After taking the consent, 2 ml of blood was withdrawn before and after 24 h of IUI for biochemical estimations. Results: We observed a significant decrease in plasma CP, PT and RBC AChE ( P < 0.001) following IUI compared with the respective pre-procedure levels. Highly sensitive CRP showed a marginal increase after IUI. Conclusion: Fluctuations in levels of the above parameters point to their role in the female reproductive system and in the outcome of the IUI.