Hormone tracking goes wearable

I've been watching the hormone-tracking space for a while, and the $11M raise for Clair Health feels like a genuine inflection point. The key differentiator here is the noninvasive approach - no blood draws, no interstitial fluid probes. If they can validate that their sensor stack (likely impedance spectroscopy + photoplethysmography) reliably correlates with serum hormone levels, they bypass the biggest adoption barrier for continuous monitoring. But here's the question that keeps nagging me: how do they handle the lag between peripheral biomarkers and actual endocrine events? Inflammation markers and bloating are downstream effects - by the time they show up, the hormonal cascade has already happened. For perimenopause management, that might still be useful for pattern recognition. For cycle irregularity detection, though, you're essentially diagnosing a problem after it's already occurred. Is reactive insight enough, or do we need predictive models that can forecast shifts 24-48 hours ahead? The bigger play might be in the longitudinal data they'll accumulate. Once you have thousands of women wearing this for 6+ months, you can start building reference ranges for normal variability across different life stages - something that's shockingly absent from current medical literature. That's where the real value lives, not in the daily readout. Anyone else thinking about how this intersects with the FDA's stance on software-as-medical-device for cycle tracking? They've been tightening definitions around fertility apps lately.