Dyshemoglobins and Pulse Oximetry: How COHb and MetHb Influence Measurement Accuracy   Pulse oximetry has become central to physiological monitoring across wearables, medical devices, and clinical research studies. Yet even the most advanced sensor architectures face fundamental challenges when hemoglobin exists in altered forms—known as dyshemoglobins . Carboxyhemoglobin (COHb) and methemoglobin (MetHb) change light absorption in ways that directly influence SpO₂ readings an

Accurate oxygen saturation measurement is foundational for modern physiological monitoring, especially for developers of pulse oximeters, wearables, and multiparameter platforms. Yet many devices fail to achieve regulatory expectations because their performance is never tested across the full range of oxygen saturation levels humans experience.  Controlled desaturation studies fill this gap, ensuring claims reflect real-world performance. These studies intentionally and safel

Engineering leaders developing physiological monitoring devices often encounter references to “arterial line measurements” in validation standards and technical literature. Although arterial lines are invasive and placed in clinical environments, the data they generate is central to how the industry defines accuracy for non-invasive technologies.  This article explains what an arterial line is, why its measurements are considered a benchmark, and how arterial line data is use

Engineering Reliability: What CTOs Need to Know About Regulatory-Grade Physiological Monitoring Validation   CTOs in medical-device startups face an engineering challenge that extends far beyond hardware and firmware. The success of a physiological monitoring product—whether a pulse oximeter, blood pressure monitor, or wearable sensing platform—depends on rigorous clinical research studies capable of supporting FDA and CE mark submissions. The gap between early engineering va

How PRL Ensures Data Integrity in Physiological Monitoring Research   For CTOs and technical leaders in MedTech, data integrity is not a paperwork detail—it is the backbone of regulator-ready evidence. Whether your device requires pulse oximetry testing during controlled desaturation in a hypoxia lab, multi-parameter wearables validation, or multi-site clinical research studies, every data point must be defensible. ALCOA+ provides the industry-standard framework for achieving

Introduction: Verification Defines Trust in Pulse Oximetry Pulse oximeters are among the most widely used physiological monitoring devices—found in hospitals worldwide. Yet, behind every reliable SpO₂ reading lies a complex scientific process: verification against reference standards . Pulse oximeter verification studies (or pivotal studies) confirm how closely a device’s functional oxygen saturation (SpO₂) values align with the true arterial oxygen saturation (SaO₂), measure

Introduction: The Foundation of Reliable Oxygenation Research   Controlled desaturation studies are central to validating  pulse oximeters . These studies, performed in specialized hypoxia laboratories  such as PRL, safely lower arterial oxygen saturation (SaO₂) to predefined plateaus, typically from %100 to 70% SaO₂, generating reference data used to calibrate or verify pulse oximeters.  At the core of this process lies one indispensable element: accurate blood gas analysis

The Hidden Measurement Problem Behind COVID-19 Hypoxia   During the height of the COVID-19 pandemic, clinicians encountered a puzzling trend: individuals with dangerously low arterial oxygen levels often appeared clinically stable and comfortable. While “silent” or “happy” hypoxia drew headlines, an equally critical issue— occult hypoxemia —posed a more subtle risk.  Occult hypoxemia  occurs when pulse oximetry readings overestimate true arterial oxygen saturation (SaO₂), mas

The Growing Importance of Precision in Oxygen Monitoring   From hospital wards to fitness wearables, pulse oximeters  have become indispensable tools for noninvasively measuring blood oxygen saturation (SpO₂). Yet the accuracy of these devices, particularly across diverse skin tones and environmental conditions, has come under scrutiny in recent years.  As regulatory bodies and clinical researchers call for more inclusive and transparent validation, the need for a specialized

A Persistent Problem Hidden in Plain Sight   For decades, pulse oximetry has served as a cornerstone of clinical monitoring—offering a quick, noninvasive estimate of blood oxygen saturation (SpO₂). Yet, the COVID-19 pandemic exposed a long-standing and underappreciated flaw: pulse oximeters can overestimate oxygen levels in individuals with darker skin pigmentation .  Inaccurate SpO₂ readings may mask hypoxemia , delay treatment decisions, and contribute to existing health di

Why Arterial Line Monitoring Matters in Research   When evaluating new medical devices—particularly those designed for physiological...

Why Accuracy in Oxygen Monitoring Matters   Pulse oximeters are among the most widely used medical devices in hospitals, clinics, and...