Delayed Rupture Syndrome (DRS)

Delayed Rupture Syndrome (DRS) is an ovulation disorder, seen on ultrasound, in which the follicle ruptures late. The dominant follicle, the fluid-filled sac that holds the egg, collapses later than the woman's charted Peak Day would predict. Dr. Thomas W. Hilgers developed and defined DRS as part of NaProTechnology.¹

Normally, the follicle ruptures close to Peak Day. In DRS, the follicle persists for a measurable time beyond the expected window. It then collapses.

Finding this pattern requires a series of ultrasounds around the time of ovulation. On the scan before expected ovulation, the follicle is present and appears mature. A later scan shows that it collapsed late.

DRS differs from Luteinized Unruptured Follicle Syndrome, in which the follicle never ruptures at all. It also differs from Partial Rupture Syndrome, in which the follicle begins to collapse but does not finish. In DRS, the follicle does rupture, but at a time that does not match the Peak Day signal.

The result is a timing mismatch. Couples who time intercourse by Peak Day are aiming at a window that misses actual ovulation. A chart can appear regular while ovulation occurs at the wrong time.

DRS belongs to Hilgers' sonographic classification of ovulation disorders. It also has implications for hormones around the time of ovulation. These include the LH surge and the quality of the corpus luteum, the structure that forms from the follicle after ovulation.

The diagnosis of DRS requires a follicle maturation study. Chart data alone cannot make the diagnosis. A restorative workup looks for the underlying hormonal problem.

The aim is to align the timing of actual ovulation with the fertile signs on the chart. Where needed, ovulation support based on NaProTechnology can then address the problem.