Sunday, July 18, 2010

Tubal Length Predicts Pregnancy After Tubal Ligation Reversal

The fallopian tube lengths remaining after a tubal ligation procedure are important determinants of the chances of getting pregnant after tubal reversal surgery. (Normal fallopian tube length before a tubal ligation is approximately 10 cm or 4 inches.)

Tubal segment lengths are measured routinely during surgery at Chapel Hill Tubal Reversal Center. The average length of the two fallopian tubes after repair was correlated with the likelihood of pregnancy after tubal reversal (Table 6). Women with longer tubal lengths had higher pregnancy rates than women with shorter lengths following tubal reversal. Women with tubal lengths of 7.5 cm or longer had a pregnancy rate of 77%. The pregnancy rate declined as tubal length decreased, but even women with the shortest tubes (less than 2.5 cm) became pregnant (38%). Although previously unreported in the medical literature, it is clear from this study that a repaired fallopian tube of any length can result in pregnancy. Based on reports by women with only 1 fallopian tube, we now know that tubal lengths as short as 1 cm can result in a normal pregnancy.



Table 6. Pregnancy Rates by Tubal Length (cm)
Length
Total Women
Pregnant (No.)
Pregnant (%)
7.5+
469
362
77%
5.0-7.4
2826
1966
70%
2.5-4.9
1602
920
57%
<2.5
112
42
38%

To learn more about how to become pregnant after tubal ligation, check out the Chapel Hill Tubal Reversal Center website. Detailed pregnancy statistics are available from the Tubal Reversal Pregnancy Study 2009.

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