Intratubal Pressure (ITP)

By RRM Academy Reviewed by Dr. Naomi Whittaker, MD, Board-Certified OBGYN, MIGS, NFPMC, FCI Updated May 14, 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, converting the standard binary open-or-closed assessment into graded resistance data.

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 measurement addresses all three questions with a single continuous variable.

Published reference data from the foundational ITP study correspond pressure measurements to distinct patency states ranging from freely patent through partial obstruction to complete obstruction.¹ Pressure at or above the threshold for partial obstruction triggers transcervical catheterization of the fallopian tubes. Post-catheterization ITP measurement confirms whether the obstruction resolved or persists, providing a procedural endpoint that anatomy alone cannot supply.

ITP measurement is performed as part of selective salpingography and pairs with HSG imaging to guide restorative tubal intervention. Graded patency assessment allows clinicians to intervene before a couple with tubal factor infertility is directed toward tube bypass. Where ITP confirms complete obstruction, the data supports the clinical case for surgical evaluation, including fallopian tube recanalization or assessment for hydrosalpinx. The measurement is a decision tool: it replaces assumption with data.

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.