Partosure and cervical cerclage

[allthesharks]

I'm 26 weeks pregnant and had two previous preterm deliveries. I have a cerclage due to short cervix. I had contractions yesterday and went to hospital where they did a partosure test which came back negative. I hadn't heard of partosure as fetal fibronectin was widely used in my previous pregnancies so I've read about it online today and it says that one of the contraindications is a cervical cerclage. So is the negative result not as reassuring as I first thought? I've still been having tightenings and they've increased in frequency and intensity again this evening.

Hey, hope you’re feeling better now. I’m not sure exact details on how reliable partosure is if you have a cerclage in - seems to me it would be more likely to give a false positive than a false negative though?
I guess either way the main point is obviously you’re higher risk, and even the best tests can get it wrong sometimes, so if you are feeling your contractions have increased then you should call back and get things checked out again. X

Thank you for your response. I was thinking that the cerclage wouldn't allow the protein to enter the vagina as it would be holding the cervix closed rather than allowing it to partially open where amniotic fluid could escape, which is where the protein comes from.

Hopefully you're right and its that it could give a false positive and not the other way around.