Abstract: A compact in vitro diagnostic (WD) device is used to provide in vitro model-based diagnosis and a basis for model-based therapy planning. The IVD device and an associated procedure may be used to assess the effect of drugs on the electro-physiological phenotype of cardiomyocytes or any cell of a patient. The effects may be assessed in a clinical environment. The assessed information for the patient may be combined with clinical data for the patient and provided to a database. The database may collect the assessment results and clinical patient data for a plurality of patients. The information in the database may be used to assist in therapy planning for future patients.