PCOSDiagnosisRotterdam Criteria

The Rotterdam Criteria Explained: How Specialists Diagnose PCOS

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Florya Medical Team

April 16, 2026 • 6 min read

"If you’ve been searching for answers about irregular periods, adult acne, or difficulty losing weight, you’ve likely come across the term "PCOS." But how do doctors actually determine if you have Polycystic Ovary Syndrome? Diagnosis isn't based on a single blood test or a feeling; it follows a specific clinical framework called the Rotterdam Criteria."

Established in 2003, the Rotterdam Criteria is the international gold standard for diagnosing PCOS. To be diagnosed, a woman must meet two out of the three following criteria, provided other underlying conditions have been ruled out by a physician.

Because you only need two criteria, PCOS can look very different from one woman to another. One person might have regular periods but struggle with severe acne and polycystic ovaries on a scan. These different combinations are known as PCOS Phenotypes.

Because PCOS is a "diagnosis of exclusion," your doctor will also want to rule out thyroid issues or prolactin imbalances that can mimic these symptoms. Arriving at your appointment with a clear history of your cycle and physical symptoms is essential.

The Florya app is built around the Rotterdam Criteria. When you track your symptoms and input your lab results into Florya, our evidence-based engine maps your data directly to these clinical standards.

By taking the Florya assessment, you generate a Physician-Ready Report that clearly outlines which of the Rotterdam Criteria your data supports. Bringing this to your specialist helps them see the diagnostic patterns immediately, fostering a collaborative and efficient path to the right management plan for your unique body.

The Three Criteria

  • 1. Irregular or Absent Periods This refers to cycles that are consistently longer than 35 days, or having fewer than nine periods in a year.
  • 2. Signs of High Androgens Clinical signs include hirsutism or severe acne. Biochemical signs are confirmed through blood work showing elevated testosterone.
  • 3. Polycystic Ovaries on Ultrasound A specialist looks for 12 or more small, immature follicles on one or both ovaries, or an increased ovarian volume.
Decoding Data

Decoding Your Body with Florya

Navigating these symptoms can feel overwhelming, but you don't have to do it alone. The Florya app was designed to help you decode your body’s signals by tracking your symptom patterns and identifying potential red flags early on.

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