A value chain analysis of the Blood Oxygen Saturation Probe ecosystem reveals a flow that begins with raw component suppliers and ends with clinical and home‑care users. Upstream, semiconductor and optical‑sensor vendors provide photodiodes, LEDs, and polymer substrates. Midstream, OEMs assemble probes, embed firmware, and obtain regulatory clearance. Downstream, distributors and system integrators embed probes into patient monitors, ventilators, or wearable platforms, delivering the finished solution to hospitals, ambulatory clinics, and home‑care patients. Value is generated by converting raw photonic components into calibrated, FDA‑cleared probes and captured through device sales, service contracts, and data‑licensing arrangements. Revenue streams are reinforced by recurring calibration services and software licensing, extending the monetary life cycle of each probe.