1. Introduction to Magnetic Nanosystems: Classifications, Structure, Properties, Biological Interactions and Diagnostic Applications 2. Synthesis and Processing Methods of Magnetic Nanosystems for Diagnostic Tools and Devices: Design Strategies and Physicochemical Aspects 3. Surface Functionalization or Modification Strategies of Magnetic Nanosystems 4. Characterization Techniques of Functionalized Magnetic Nanosystems 5. Biocompatibility and Toxicity Assessments of Functionalized Magnetic Nanosystems 6. Functionalized Magnetic Nanosystems for Diagnostic Tools and Devices: New Perspectives in Disease Diagnosis 7. Functionalized Magnetic Nanosystems for Point of Care and Point of Need Diagnostic Applications 8. Biogenic and Biomimetic Functionalized Magnetic Nanosystems: Synthesis, Properties and Biomedical Applications 9. Functionalized Magnetic Nanosystems for Cancer Diagnosis and Therapy 10. Functionalized Magnetic Nanosystems for Immobilization of Proteins and Enzymes 11. Functionalized Magnetic Nanosystems for Diagnostic Tools and Devices in Bio-Barcodes and Smartphones 12. Functionalized Magnetic Nanosystems for Medical Imaging 13. Functionalized Magnetic Nanosystems for Drug Delivery Applications 14. Functionalized Magnetic Nanosystems for Tissue Engineering Applications 15. Functionalized Magnetic Nanosystems for Molecular Detection of Biomarkers 16. Functionalized Magnetic Nanosystems for the Detection and Control of Infectious Diseases 17. Functionalized Magnetic Nanosystems in Nanomedicine 18. Functionalized Magnetic Nanosystems for In-vivo Treatment of Diseases 19. Functionalized Magnetic Nanosystems Based Electrochemical Sensors for Medical Diagnostic Tools and Devices 20. Functionalized Magnetic Nanosystems for Narco Drug Detections and Military Applications 21. Polymer Mediated Functionalized Magnetic Nanosystems for Biomedical Applications 22. Mesoporous Core-Shell Structured Functionalized Magnetic Nanosystems for Diagnostic Tools and Devices 23. Functionalized Magnetic Nanogels for Diagnostic Tools and Devices 24. Functionalized Magnetic Nanocomposites/Hybrids for Diagnostic Tools and Devices 25. Safety Considerations, Environmental, Legal and Health Impact of Functionalized Magnetic Nanosystems 26. A Futuristic Insight into Functionalized Magnetic Nanosystems for Diagnostic Tools and Devices: From Lab to Commercial Applications