Objective: The aim of the study was to determine the importance of β-hCG level on day 4 following methotrexate (MTX) administration, and the difference between β-hCG levels assessed on day 0 and day 4 in predicting treatment success.
Material And Methods: A total of 68 women with tubal pregnancy, treated with a single dose of MTX, were selected for this retrospective study.
Results: The success rate of single-dose MTX treatment in our clinic was 75% (51/68). Among 51 patients in whom MTX treatment was successful, 25 (36.8%) showed a decrease in β-hCG level of > 15% on days 0 and 4, and 44 (64.7%) showed a β-hCG level decrease of > 15% on days 4 and 7. For subjects with β-hCG decrease of > 15% on days 4 and 7, the standard error was 6.5%, and the area under the ROC curve was 81.7%, while the corresponding values for days 0 and 4 were 7.2% and 64%, respectively.
Conclusions: A decrease of > 15 % in β-hCG levels between days 0 and 4 does not seem to be a better predictor for success of single-dose MTX treatment for ectopic pregnancy than between days 4 and 7. A statistically significant difference was observed only in β-hCG levels on day 7 in both, successful and unsuccessful single-dose MTX groups.
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