Toe-may-toe, toe-mah-toe, poe-tay-toe, poe-tah-toe... 

You say Electronic Medical Record, I say Electronic Health Record.  You say EMR, I say EHR.  Same difference, right?  Well, not exactly.  There is a technical distinction that is important to understand.  Electronic Medical Records are the legal record of the Care Delivery Organization (i.e. Doctor) and reflect the clinical services that were provided.  Electronic Health Records are a subset of the information in an EMR but span multiple CDOs and are owned by the patient.

In other words, the EMR is the detailed record of what a single doctor did to a patient (e.g. "Patient presented with paper cut on finger.  Removed affected arm and prescribed Oxycodone." or "Patient mutated into giant turtle after exposure to nuclear waste.  Treated with pizza and released.")  While the EHR is the history of all of a single patient's encounters (e.g. "Went to Dr. A because of pain in my beak.  Dr. A performed tests then referred me to a specialist.  Went to Dr. B on referral.  Dr. B performed more tests then referred me to another specialist.  Went to Dr. C on referral.  Dr. C performed even more tests then told me he was pretty sure I was a pigeon and should really see a vet instead.")

Right now EMR systems are becoming more common at the practitioner level and there really is no good EHR.  There are a few services available on-line but the government is looking to come up with a national system that will be compatible across all vendors.  To learn more, read this article:

http://www.himssanalytics.org/docs/WP_EMR_EHR.pdf