No. You test at home with a CE-certified kit that uses a small capillary blood sample — no needles in a vein, no appointment. You follow the instructions, then mail it back in the prepaid packaging to our certified partner lab.

The kit collects blood from the surface of your skin rather than a deep vein draw, so most people find it quick and near-painless — closer to a firm press than a jab.

Your wearable estimates recovery and readiness from signals like heart rate and HRV. We measure what's actually happening inside your body with lab-grade blood work — and then reads it alongside your wearable data, so you get the full picture instead of a proxy.

A typical season includes around three tests, timed to your training: a baseline at season start, a mid-build check when iron and energy tend to quietly erode and a pre-race check to see whether you're absorbing the work or overreaching. We tell you when each one matters based on your race date.

Your data is yours. It's stored securely on EU-based infrastructure, used only to generate your insights, and never shared without your explicit, specific consent. You'll see a clear privacy notice and consent flow before anything is processed.