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If scar tissue will form, it happens within a matter of weeks following surgery. Fortunately, this is not the likely scenario since 95% of the time the tubes remain open.
Dr. Berger recommends waiting 8 - 12 months (preferably 12) before having the HSG testing since this really gives you a reasonable amount of time to achieve pregnancy before having the HSG testing, which does carry some risk and a fair amount of expense.
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I believe that if it is gonna happen that it will happen during the first six months of the healing process. That is why Dr B suggests waiting until it has been at least six months before having an HSG to see if the tubes are still open! Hope that helps!