Hi if my wife has been on iud for over a coupler of years , and her bleeding is more like brown stains and not actual flow is that indicative of her not being a full niddah ?
It would depend on the exact color of the stains. You should show them to a Rav and he can tell you if she’s a Nidda. Additionally, he can tell you if in the future you have to ask about similar stains. Make sure to mention that she is on a hormonal IUD.
All the best