12/11/2025
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THE PURPLE LINE OF LABOR
As mama breathes, rocks and moves her body with the dance of labor a surprising mark may begin to emerge. The mark of progress, success, evidence that she is further in the journey towards bringing her baby earth side. Left in an oxytocin bubble, dim lights, surrounded by love, the process uninterrupted, her support team need only take notice of this and other signs, rather than break her rhythm with physical touch. It is the mark of the mother, the maiden exiting…
For some women, an amazing phenomenon happens during labor – a purple line starts as a subtle dot just above the a**s and slowly lengthens in correlation with dilation up mamas bum as labor progresses. At 10cm the line is just above the intergluteal cleft, the top of the bum crack.
While the line may vary with skin color, varying from brown to silver in women of color, according to studies it appears in 75.3% of women during the active phase of labor and has a 96.5% positive predictive value in the first stage of labor and an 85.32% positive predictive value overall.
So why does this happen?
According to Byren DL & Edmonds DK, authors of the original study, the cause of the line is vasocongestion at the base of the sacrum due to intrapelvic pressure as the head descends, which accounts for the correlation between station and the length of the line.
The World Health Organization recommends limiting vaginal exams during labor. While they can be very helpful and often necessary at times, they also come with risks such as infection, rupture of membranes and disruption of progress. That and they are incredibly uncomfortable! As such, the purple line can act as a gentle, non-intrusive way to measure progress. If anything else it’s pretty amazing when you have the honor to witness it!!
Look in the comments for actual photos 🙂
💜 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4329935/
💜https://www.scienceandsensibility.org/blog/the-red/purple-line-an-alternate-method-for-assessing-cervical-dilation-using-visual-cues