A drug monitoring tool that enables a patient to view a personalized real-time indication of clotting factor VIII levels following a prophylactic infusion event, the tool comprising: a data receiver configured to receive, from a secured server, a pharmacokinetic profile of a patient, wherein the secured server is configured to create a Bayesian model of PK profiles of sampled patients and based upon at least one of a bodyweight, von Willebrand factor ("vWF") level, and/or an age of the patient.; and an interactive user interface wherein the interactive user interface includes a graphical control element configured to receive patient input corresponding to a request for the time-varying amount of the therapeutic plasma protein within the patient; the interactive user interface being configured to: display to the patient a graphical representation of a time-varying therapeutic plasma protein level of the patient, the time-varying therapeutic plasma protein level based on an administered dose of a clotting factor VIII and the PK profile of the patient; and delineate zones associated with the time varying amount of the therapeutic plasma protein, wherein each zone is associated with a particular concentration range of the time-varying amount of the therapeutic plasma protein within the patient, the zones including a safe zone which indicates that the patient's level of therapeutic plasma protein indicates a level of clotting factor VIII such that the patient is safe for physically demanding activity; and a danger zone which indicates that the patient's level of therapeutic plasma protein indicates a level of clotting factor VIII such that activity levels of the patient should be kept to a minimum. a data receiver configured to receive, from a secured server, a pharmacokinetic profile of a patient, wherein the secured server is configured to create a Bayesian model of PK profiles of sampled patients and based upon at least one of a bodyweight, von Willebrand factor ("vWF") level, and/or an age of the patient.; and an interactive user interface wherein the interactive user interface includes a graphical control element configured to receive patient input corresponding to a request for the time-varying amount of the therapeutic plasma protein within the patient; the interactive user interface being configured to: display to the patient a graphical representation of a time-varying therapeutic plasma protein level of the patient, the time-varying therapeutic plasma protein level based on an administered dose of a clotting factor VIII and the PK profile of the patient; and delineate zones associated with the time varying amount of the therapeutic plasma protein, wherein each zone is associated with a particular concentration range of the time-varying amount of the therapeutic plasma protein within the patient, the zones including a safe zone which indicates that the patient's level of therapeutic plasma protein indicates a level of clotting factor VIII such that the patient is safe for physically demanding activity; and a danger zone which indicates that the patient's level of therapeutic plasma protein indicates a level of clotting factor VIII such that activity levels of the patient should be kept to a minimum. display to the patient a graphical representation of a time-varying therapeutic plasma protein level of the patient, the time-varying therapeutic plasma protein level based on an administered dose of a clotting factor VIII and the PK profile of the patient; and delineate zones associated with the time varying amount of the therapeutic plasma protein, wherein each zone is associated with a particular concentration range of the time-varying amount of the therapeutic plasma protein within the patient, the zones including a safe zone which indicates that the patient's level of therapeutic plasma protein indicates a level of clotting factor VIII such that the patient is safe for physically demanding activity; and a danger zone which indicates that the patient's level of therapeutic plasma protein indicates a level of clotting factor VIII such that activity levels of the patient should be kept to a minimum.