Bioinformatics has evolved from traditional heart rate (HR), Electrocardiograph (ECG), Oxygen Saturation (Sp02) monitoring at hospital setting; To body/ wearable sensor networks with the use of smartphones, watches and clothes embedded with smart sensors; To measure body vital signs, applying a ubiquitous ISO/IEEE 11073 (X73) Personal Health Data standard. This book analyses how standards can be applied to archive an interoperable and heterogeneous health network of wearable sensor devices for both local and remote health monitoring. The implementation of the standard limitations are explained, that hinder developers to develop interoperable mobile health (mHealth) application. The extensive literature review of this book stress on existing non-compliant wearable health technology sensor devices e.g branded health watches, smartphones, even clothes and a few standard compliant health sensor devices are described. Ideally this book intent is important to standard integrators, medical device manufacturers and application developers. To archive the goal of IEEE11073 PHD standard and Continua Health Alliance Standard, Device Stadndard Certification and design guidelines available.