Background: The Heart Failure Caregiver Questionnaire (HF-CQ®) was developed to assess subjective outcomes of heart failure caregivers. The HF-CQ® comprises 21 questions on three domains, namely physical, emotional/psychological and lifestyle. The objective of this study was to evaluate the psychometric properties of the HF-CQ®. Methods: Patients (n = 150) with heart failure and their primary caregivers (n = 150) were recruited from 11 sites in USA.