You only need 1 mg for lab max. That means only one tenth of a tab. If you used one quarter that's too much. I've heard it stressed that too much will squew the results.
I have one more lab max vial for the var test. The paper with lab max said 1/8 of a pill so I used about what I thought was half a quarter.. my result was a much darker green than rutmans results were. I pinged darius asking about the color difference of yellow pills and orange, see if what he says makes sense or not. I'll test again with a smaller amount.