What is the standard of proof for medical evidence?

The VA standard of proof for medical evidence is whether, after review of the veteran’s complete medical records, the evidence (at a minimum) shows that “it is as least as likely as not” that a current condition originated from an in-service injury or disease. Therefore, if a private physician cannot attest to the fact as a matter of medical certainty, he may be amenable to saying that it is “at least as likely as not” that a condition occurred during, or as a result of, military service. His opinion must be based upon his own examination AND a review of the veteran’s complete medical record.