What are the steps to confirm if my water has broken?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Doctors diagnose premature rupture of membranes (PROM) through a physical exam combined with specialized tests. A nitrazine test measures the pH of the fluid, while a fern test examines it under a microscope for a characteristic crystallized pattern. Both help confirm whether the leaking fluid is amniotic fluid, indicating your water has broken.

If you're experiencing unusual leaking, cramping, or other pregnancy concerns, don't wait to get clarity. Understanding your symptoms early can be critical for both your health and your baby's. Take a free, instant, online symptom check to better assess what may be happening and determine whether you need immediate medical attention or a routine follow-up. It's a fast, private way to organize your concerns before speaking with your doctor.

Reviewed for medical accuracy: 07/15/2026

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Explanation

If you think your water has broken, your healthcare provider will follow a few steps to confirm it. First, they will ask you about your symptoms and then do a speculum exam to take a closer look inside your vagina. This helps them see if there is any clear, watery fluid present.

Next, they might perform a nitrazine test. For this test, they take a sample of the fluid, place it on a strip of paper, and check for a color change that shows if the fluid is more alkaline—just like amniotic fluid. They may also do a fern test, where a drop of the fluid is placed on a slide. When the fluid dries, it sometimes makes a pattern that looks like fern leaves under a microscope, which is another sign that your membranes have ruptured.

Some doctors use additional modern tests (like AmniSure) that look for specific proteins in amniotic fluid. These steps help your doctor determine if your water has broken so they can decide on the best care for you and your baby. If you're experiencing pregnancy symptoms and want to check your symptoms before contacting your provider, Ubie's free AI-powered tool can help you understand what might be happening.

(References)

Iannetta O. A new simple test for detecting rupture of the fetal membranes. Obstet Gynecol. 1984 Apr;63(4):575-6. PMID: 6700905.
Davidson KM. Detection of premature rupture of the membranes. Clin Obstet Gynecol. 1991 Dec;34(4):715-22. doi: 10.1097/00003081-199112000-00007. PMID: 1778013.
Thumm B, Walsh G, Heyborne KD. Diagnosis of rupture of membranes: AmniSure, clinical assessment, and the Food and Drug Administration warning. Am J Obstet Gynecol MFM. 2020 Nov;2(4):100200. doi: 10.1016/j.ajogmf.2020.100200. Epub 2020 Aug 14. PMID: 33345917.

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