Tubal Reversal Pregnancy Study 2009

Pregnancy Rates By Fallopian Tube Lengths

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 became apparent during 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.

Tubal Ligation Method And Tubal Length

When tubal ligation method and average tubal lengths are taken into account simultaneously, it becomes clear that the amount of fallopian tube remaining after a sterilization procedure is the more important factor predicting the chances of getting pregnant after tubal reversal surgery (Table 7). This makes sense, since the less damage that occurs to the fallopian tube during a sterilization procedure, the more remains to be able to function normally once the tube has been surgically repaired.

Tubal Reversal Pregnancy Study 2009
Table Of Contents:

• Overview
• Study Method
• Patient Population – US States
• Patient Population – Age and Tubal Ligation Procedures
• Pregnancy Rates by Age and Method
• Tubal Reversal Pregnancy Rates by Tubal Lengths (this page)
• Pregnancy Outcomes
• Tubal Reversal vs. IVF
• About Pregnancy Statistics

Pregnancy Outcomes After Tubal Reversal

Tubal Reversal Pregnancy Study Report 2009

About Tubal Reversal Pregnancy Statistics

Gary S. Berger, MD
Medical Director

What To Believe

Claims about the chances of getting pregnant after tubal reversal are often made without supporting documentation such as the number and characteristics of the patient population, study method, and length of follow-up after surgery. These are essential for understanding the basis of pregnancy rates. Statistics must be based on specified numbers of patients for any characteristic, such as age or tubal sterilization method. Most internet sites about tubal reversal do not provide any data at all. Although a doctor can say that his patients have a high success rate, supporting documentation is needed to know whether the claim is valid. The accuracy of any claim of success rates should be questioned in the absence of detailed information.

Evidence Based Medicine

The only way a doctor can truly know what the pregnancy and outcome statistics are for his or her patients is to maintain ongoing patient contact about the outcomes of treatment and record the information systematically in an analytical database. At Chapel Hill Tubal Reversal Center, nurses enter information into an electronic patient database at the patient’s registration, the surgical procedure, and all post-operative communications between patients and staff. Patients are contacted routinely by our nurses during the first year after their tubal reversal procedures.

Chapel Hill Tubal Reversal Center Database

The comprehensive follow-up database at Chapel Hill Tubal Reversal Center is unique. We know of no other doctor or medical facility with a follow-up system and database that can provide such accurate statistics about the chances of getting pregnant after tubal reversal and the outcomes of the pregnancies that occur.

Limitations And Possible Under Reporting

Although we encourage patients to inform us when they have a positive pregnancy test, not all pregnancies are ascertained. Some patients become lost to follow-up after surgery. This occurs when someone moves or changes email address and telephone numbers but does not provide their new contact information to us. In these cases, we may not find out about the long term outcomes of their tubal reversal procedures unless they complete the Pregnancy Report Form each time they conceive. We know that not all patients adhere to this protocol. From the women who do remain in contact with us over the long term, however, it is clear that new pregnancies continue to occur as time passes after surgery. The pregnancy rates reported in this study, therefore, are minimal estimates of the cumulative pregnancy rates for patients at Chapel Hill Tubal Reversal Center.

Tubal Reversal Pregnancy Report 2009
Table Of Contents:

• Overview
• Study Method
• Patient Population – US States
• Patient Population – Age and Tubal Ligation Procedures
• Pregnancy Rates by Age and Method
• Pregnancy Rates by Tubal Length
• Pregnancy Outcomes
• Tubal Reversal vs. IVF
• About Pregnancy Statistics (this page)

Weekly Pregnancy Announcements From Chapel Hill Tubal Reversal Center Patients

Tubal Reversal Pregnancy Report 2009

Pregnancy Rates At Chapel Hill Tubal Reversal Center

From July 2000 to June 2008, 5046 women underwent tubal ligation reversal at Chapel Hill Tubal Reversal Center. The operative techniques of microsurgical tubal anastomosis, tubouterine implantation, and salpingostomy were used as appropriate to each patient’s situation, and often these techniques were combined in a single case. Including all women’s ages, methods of tubal ligation, and operative techniques used for tubal reversal, the overall pregnancy rate was 66% based on 3317 pregnancies reported during this 8 year interval.The following tables show pregnancy rates specific for age, method of tubal ligation, and remaining tubal lengths available for repair and the interaction between these factors.

Pregnancy Rates By Age

As expected, younger women had higher pregnancy rates than older women. The pregnancy rate after surgery ranged from 80% for women under 30 to 31% for women 40 years of age and older (Table 3).

Pregnancy Rates By Tubal Ligation Method

Reversal of tubal clip procedures had the highest pregnancy rate (75%), followed by tubal rings (72%), coagulation (66%) and ligation/resection (63%). Patients with other or unknown methods of tubal ligation had the lowest pregnancy rate (54%).

Pregnancy Rates By Age And Method

Pregnancy rates taking into account both age and tubal ligation method are shown in Table 5. The highest pregnancy rate (90%) was reported by women under 30 years of age who had reversal of a previous clip method of sterilization. Of the two variables, age is more predictive than tubal ligation method regarding the likelihood of becoming pregnant after reversal surgery.

Tubal Reversal Pregnancy Study 2009
Table Of Contents:

• Overview
• Study Method
• Patient Population – US States
• Patient Population – Age and Tubal Ligation Procedures
• Pregnancy Rates by Age and Method (this page)
• Pregnancy Rates by Tubal Length
• Pregnancy Outcomes
• Tubal Reversal vs. IVF
• About Pregnancy Statistics

Pregnancy Rates By Tubal Lengths