24 hour urine test

Krista
I have been in the hospital for almost 72 hours. I was transferred and brought by EMTs because of hbp, protein found in my urine, headaches, blurred vision, and swelling. I was told I maybe preeclamptic to had to do a 24 hr urine test. The hospital staff didn't proved me with much to drink except little cups of water and ice chips needless to say I didn't pee a lot but my test result were over 300. The doctor has ordered me to do the test again to make sure the test results weren't concentrated. My question is if the results can be concentrate can they be diluted? I'm drinking a lot but probably more than normally. I just want an accurate reading. Anybody have a similar experience? I'm 37 weeks almost 38.