Inadequate follow-up of diagnostic testing can lead to missed or delayed diagnoses. Based on interviews with healthcare workers at Veterans Affairs (VA) facilities across the United States, this qualitative study identified factors contributing to lack of timely follow-up of abnormal test results. The most commonly cited factors included trainee/resident involvement, absence of a process to address incidental findings on imaging, lack of standardized electronic health records (EHR) and related tracking systems, and lack of updated patient and provider contact information. The authors summarize participant recommendations to reduce missed test results.