Abstract
Aim: Abortion is the termination of pregnancy before the 20th gestational week or when the fetus is below 500 g. Its prevalence is between 50-70% in all pregnancies. Routine histological examination (HE) of abortion materials is controversial in terms of molar pregnancy (MP) diagnosis. This study aims to determine the necessity of HE by evaluating the MP frequency and pre-diagnosis success of abortions in our clinic. 
 Materials and Methods: In this retrospective study, 1007 women whose pregnancy resulted in abortion between 01.01.2019-01.01.2022 and whose demographic data, USG findings, pre-diagnoses and HE results were present, were included. The preliminary diagnoses of patients with CMH and PMH were compared with the HE results. 
 Results: Among the materials sent to pathology for HE, the most common diagnosis was missed abortion with 590 (58.78%). MP was detected in 32 (3.17%) women. Of these, 9 (0.89%) were found to be CMH, while 23 (2.28%) were PMH. While 6 (66.6%) of 9 patients diagnosed with CMD were prediagnosed with CMD, 10 (43.37%) out of 23 patients diagnosed with PMH were prediagnosed as PMH.
 Conclusion: Since the prevalence of MP is 3.17% and there is a high inconsistency between the pre-diagnosis and the result of HE, we recommend that all abortion materials be performed with HE.
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