Hi,

The eligibility criteria for MCAT is mentioned below:

• For Canada and US candidates, undergraduate degree is required.
• For International candidates, It is mandatory to be pursuing or have the MBBS degree.

So, being a PhD even cannot make to eligible to appear for the MCAT. MCAT is conducted for admission into the DO, MD, DPM and DVM programs.

Know more details about MCAT here: https://studyabroad.careers360.com/exams/mcat