Carol, I had the same problem, I couldn't pee, even increasing liquids. I went about a quarter of a cup in twenty four hours and then, instead of addressing WHY I cant pee, they threw out the whole test. Part of the problems may have been due to urethral polyps, some possibly to nerve problems from my back, and most from electrolyte imbalance due to diabetes and the liver. I would call and talk to the nurse. Drinking gatorade (sugar free equivalent or the real thing as sometimes sweeteners cause problems and beets make me pee. Asparagus makes you pee green if you really want to freak em out. Anyway, you might call the nurse and ask about dietary things and if its okay to try these things. Cranberry juice can do more to irritate things in some conditions so I try to only drink it in small amount. Gatorade has been a big help, especially since I drink distilled water which has no electrolytes.
I'm sorry you have to deliver the jug o'pee and do that. Its a good test though. You are lucky they have ordered it.
Ills--Sjogrens-Lupus cond., AI polygland. dysfunction 2, hyper/hypopigment, scoliosis,kyphosis,stenosis, deg.,O.A.,spine surgeries, salivary/lymphectomies, NASH, COPD, RLS, UT/GI bleeds, hystero, brain/nerve damage,TB
Meds--INH,Plaquenil, Evoxac, Metformin, Synthroid, HCTZ, HRT and Lidocaine patchs, Voltaren gel, Klonopin, Vicodin, Restasis, Albuterol, steroids