There is a paucity of patient reported outcome data documenting the impact of PK focused prophylaxis discussions. This prospective, multicentre UK-PK trial will coincide with the initiation of the myPKFiT® device in the context of an enhanced clinical review. This will include a standardised patient education package using a short animated film explaining PK and personalised prophylaxis, followed by modelling of the patient's own PK using the myPKFiT® device and discussing the dosing options with the patient. The aim of the PK educational package is to educate and engage patients and ensure that their treatment regimens meet their individual needs. In addition, the study will capture the prophylaxis dosing strategy agreed upon by patients and the clinical team where treatment decisions are made jointly between patients and the clinical team (concordance). Looking forward, haemophilia clinical care team members need a marker to judge or predict patient engagement with this personalising medicine process. Successful consultation strategies may differ if the team can anticipate how an individual person with haemophilia (PWH) might respond to discussions about potential change. The primary outcome measure is the Patient Activation Measure (PAM) which gauges the knowledge, skills and confidence essential to managing one's own health and healthcare. A PAM score can predict healthcare outcomes including medication adherence, healthcare utilisation and hospital visits. It is hypothesized that a more activated patient will be more receptive to changes in their treatment regimen, education and information about their health condition. In addition to patient activation, the study will assess a range of patient reported outcomes and psychological factors using validated tools. These will include patients' Haemophilia-related quality of life (HAEMO-QoL-A), beliefs about medicines (BMQ), self-reported adherence (VERITAS-Pro) and activity levels. These tools will provide clear patient reported outcomes for the haemophilia community, with accompanying EQ5D data, enabling robust health economic evaluation.

Prospective, interventional study of pharmacokinetic (PK)-focused FVIII dosing discussions delivered as part of a patient education package. The study will capture severe haemophilia A patient reported outcome measures before and after PK-focused dosing discussions, including a standardised patient education package, that include personalised PK-guided dosing suggestions from a computational predictive device (myPKFiT®). The pragmatic study design recognises the CE marked myPKFiT® device is being implemented into routine care nationally and consequently only requires a single additional clinic visit for the purpose of consenting.