According to the breed standard only black, yellow and chocolate are acceptable colors.

I do know that an albino Doberman Pinscher is not going to be a healthy animal. Not sure if that would be true with a Lab but my guess is that they would have the same health issues.

Can't point you to reference regarding albino labs but here is one regarding albino Dobermans health concerns:

http://www.dpca.org/ac.html