Final answer:
The primary difference between a PHR and an EHR or paper medical chart is the storage location.
Step-by-step explanation:
The primary difference between a PHR (Personal Health Record) and an EHR (Electronic Health Record) or a paper medical chart is indeed its storage location.
A PHR is stored and managed by the patient themselves, typically in electronic format on a computer, smartphone, or a web-based portal.
On the other hand, an EHR is typically stored and managed by healthcare providers or healthcare systems, allowing multiple authorized healthcare professionals to access and update the record.
A paper medical chart, as the name suggests, is a physical document stored in the healthcare provider's office or facility.