No, not necessarily. Metformin is often prescribed for PCOS even without a confirmed diagnosis of insulin resistance — though the reasons depend on the case.
A few things worth knowing about how this typically works:
Many women with PCOS have insulin resistance even without realizing it. Insulin resistance is common in PCOS (an estimated 70 percent of cases), but it's underdiagnosed because it often doesn't show up clearly in standard bloodwork until it's significantly progressed. Many women have insulin resistance that's affecting their symptoms without ever being formally diagnosed with it. For these women, Metformin treats a real underlying mechanism, even if the lab confirmation hasn't happened.
Metformin has effects on PCOS beyond insulin sensitivity alone. Even in women without measurable insulin resistance, Metformin has been studied for its effects on androgen levels, ovulation, and cycle regularity. It's used off-label for PCOS broadly — not only for the insulin-resistant subset of women with PCOS.
Your clinician will weigh whether Metformin fits your case. During your medical intake, your Oana clinician evaluates the full picture — your symptoms, your medical history, any bloodwork you can share, family history of type 2 diabetes, and the specific symptom pattern you're working with. Based on that picture, Metformin may or may not be the right starting point for your case. If insulin resistance appears to be a strong part of the picture, Metformin is often the first treatment to consider. If it doesn't, your clinician may recommend a different approach.
The short version: confirmed insulin resistance is one reason Metformin gets prescribed for PCOS, but it's not the only reason. Your clinician will discuss whether it's appropriate for your specific case.