For a 24 hour collection they just want to see the overall concentration of protien in your urine for an entire day.
I had an excessive amount of protien that the doc said could have been due to my having a bit of the stomach flu.
When I did have PE 12 years ago, doc had me do a 24 hour collection, then a 2 or 3 day collection as well to find out what was going on prior to diagnosing me and treating me.
www.blueribbonbaby.org has a great diet on there for PE women. If I don't follow this diet, I start to feel a little goofy. Very high protien diet. You might give it a try over the next week or so to see if you notice any difference.