Although I haven't tested it myself, I still believe you get 3 Zerg research points as a bonus when you get the lab. The same conclusion has been reached here:
I'm sorry to bump a thread this old, but I also noticed those extra Zerg research points and just in case someone finds himself here looking for a reason (as I have done just a couple of minutes ago), I would like to clarify:
The three extra points are given to you when the lab opens, as stated by Fulminator. You don't have to do anything to get them. I didn't do any sidequests on Mar'Sara.
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