Mizrachi Y, et al. - The correlation of hCG levels on the day after ovulation triggering using recombinant hCG (r-hCG) with treatment outcome was studied. Researchers observed an inverse correlation of hCG levels on the day after ovulation triggering with 250 mcg r-hCG with patient age and BMI. However, they were not found to be correlated with any clinical or laboratory outcome parameter. Therefore, after ovulation induction, testing for hCG levels appeared futile and was not recommended.