Microneedle-based wearable sensors: a new frontier in real-time biomarker monitoring.

Objective: To explore the mechanisms, applications, and future potential of microneedle-based wearable sensors for continuous, minimally invasive monitoring of biomarkers in interstitial fluid (ISF), highlighting their role in revolutionizing healthcare diagnostics and personalized medicine.

Significance: Microneedle-based sensors offer a groundbreaking alternative to conventional invasive techniques by enabling real-time monitoring of critical biomarkers such as glucose, lactate, electrolytes, pH, and oxygen. Their ability to access ISF-biochemically similar to blood-allows for accurate physiological assessment without the need for blood draws, thereby improving patient compliance and enabling broader clinical and non-clinical applications.This review synthesizes findings from recent studies on the design, sensing mechanisms (enzymatic, electrochemical, and potentiometric), and fabrication technologies of microneedle-based sensors. It evaluates current research trends, clinical trials, and advances in materials science aimed at overcoming existing limitations in sensor stability, manufacturing scalability, and cost.

Results: Microneedle-based sensors have demonstrated promising results in applications including diabetes management, athletic performance monitoring, and assessment of metabolic and hydration status. Innovations in biocompatible materials and sensor integration have improved precision and functionality. However, issues related to sensor longevity, calibration accuracy, and environmental robustness remain under active investigation.

Conclusions: Microneedle-based wearable sensors represent a transformative approach in continuous health monitoring, offering significant benefits in noninvasive diagnostics and personalized medicine. Ongoing research and development efforts are expected to address current challenges, paving the way for wider clinical adoption and integration into routine healthcare practice.