As technology continued to advance, medicine increasingly adopted non-invasive, physics-based tools capable of gathering large amounts of information quickly and safely. Today, widely used electrical and signal-based devices—such as EKG/ECG for heart activity, EEG for brain waves, EMG for muscle signals, bioelectrical impedance analysis (BIA) for body composition, and electro-interstitial scans (EIS)—allow clinicians to evaluate many aspects of the body’s function within seconds. Other methods, like photoplethysmography (used in pulse oximeters and smartwatches) and Heart Rate Variability (HRV) analysis, use light or frequency-based measurements to track blood flow, stress responses, and nervous system balance. This combination of fast electrical measurements, optical techniques, and advanced imaging gives clinicians a deeper and more comprehensive view of the body, helping identify underlying causes of health issues rather than focusing only on symptoms. When paired with traditional biological and biochemical tests, these technologies support faster, more accurate diagnoses and prevention, as well as earlier resolution of potential problems.