Sorry 'bout that. When I next loaded the game and searched the skill tree I couldn't find any mention of the Lab Table there. It is also not a schematic. And yet when I search on the Lab Table recipe, I can see it listed. Perhaps that's what it was, the recipe unlocks once you have the Weird Science quest. You have to watch out with quests and make sure you don't start them when your inventory is full - you can lose important items that way.
It seems like when I started that quest, it gave me something. Some item with an icon that looked like colored test tubes maybe? I originally thought it was a component to something, but if you have such an item then try to read it. Maybe that's what unlocked the Lab Table recipe.
I think the quest itself starts with build the Lab Table, then outfit the table, etc. So eventually you're going to need a scalpel, microscope, and something else - sorry haven't finished that quest yet.