An MD Pathologist can technically sign reports for more than two laboratories and provide registration or validation for multiple labs. The specific number of labs a pathologist can oversee or work with may vary based on regional regulations and the pathologist's professional capacity.

Regarding fees, pathologists often charge for their services based on agreements with the labs they work with. The fees for providing validation or signing off on reports can vary widely depending on factors such as the pathologist's reputation, the complexity of the work, and regional standards. For precise details on regulations and fees, you should consult with medical boards or regulatory authorities in your region.