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Updated: Jun 11, 2026
OP-IVM: Combining In vitro Maturation after Oocyte Retrieval with Gynecological Surgery
Published on: May 9, 2021
Difference between serum beta-human chorionic gonadotropin levels in pregnancies after in vitro maturation and in
Benny Almog1, Jana Al-Shalaty, Boaz Sheizaf
1McGill Reproductive Center, Department of Obstetrics and Gynecology, McGill University, Montreal, Quebec, Canada.
Objective:
To compare β-hCG levels measured as the first pregnancy test in women who conceived after in vitro maturation (IVM) or IVF.
Design:
Retrospective matched cohort analysis.
Setting:
University-based medical center.
Patient(S):
Women treated with IVM or IVF.
Intervention(S):
We studied the first serum β-hCG levels in 104 pregnant women who were successfully treated with IVM and in another 104 women with IVF treatment. Blood samplings for β-hCG were drawn on day 12-15 after ET. The two groups were matched by age, order of pregnancy, and day of blood sampling.
Main Outcome Measure(S):
First β-hCG levels.
Result(S):
Serum β-hCG levels on days 12 to 13 after ET of IVM viable singleton pregnancies were significantly higher than those of IVF pregnancies (343.2±48.4 vs. 264.0±29.2 IU/L, 95% confidence interval [CI] 22-229). Similarly, β-hCG levels on days 14 to 15 after ET of IVM viable singleton pregnancies were higher than those of IVF pregnancies (350.1±126.4 vs. 284.4±30.2 IU/L). Similar trends were found in β-hCG levels on days 12 to 13 after ET of twin viable pregnancies (IVM, 682.1±97.7 vs. IVF, 434.5±41.8 IU/L; 95% CI 44-662). Grouped linear regression with covariance analysis showed a significant difference between IVM and IVF regression lines.
Conclusion(S):
The first serum β-hCG levels in pregnancies after IVM are consistently higher than those after IVF treatment. More studies are needed to elucidate these findings.
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