Intratubal Pressure (ITP)

By RRM Academy Reviewed by Dr. Naomi Whittaker, MD, Board-Certified OBGYN, MIGS, NFPMC, FCI Updated May 7, 2026

Intratubal pressure (ITP) is a quantitative measure of fallopian tube patency obtained by recording the pressure required to advance contrast through the tube during selective hysterosalpingography, using a LeVeen pressure-monitoring syringe.

Standard HSG reports tubes as patent or blocked. That binary tells clinicians nothing about the degree of obstruction, whether a partial block is amenable to catheterization, or whether an apparently patent tube is functioning at abnormal resistance. ITP converts the qualitative into the quantitative.

Hilgers and Yeung defined three pressure thresholds from measured data: freely patent tubes at a mean of 0.53 ATM, partially obstructed tubes at 1.23 ATM, and completely obstructed tubes at 2.79 ATM.⁸⁴ An ITP at or above 0.7 ATM serves as the operational threshold triggering transcervical catheterization of the fallopian tubes. Post-catheterization ITP confirms whether the obstruction resolved or persists.

ITP measurement is performed as part of selective salpingography and pairs with HSG findings to guide restorative tubal intervention. Graded patency assessment allows clinicians to intervene before a couple reaches a point where tube bypass is presented as the only remaining option. The data drives the decision: not assumption, not calendar, not a single contrast image.

This content is for educational purposes only and does not constitute medical advice. Consult an RRM clinician or healthcare provider for guidance specific to your situation.