Dilution

Hyper saturating your body with fluids will dilute metabolites possibly below the 50 ng/mL

Hyper saturating your body with fluids will dilute metabolites possibly below the 50 ng/mL threshold, depending on your metabolism. Be aware that creatinine levels are often tested, and will show that the sample has been diluted. Diluting your sample will also produce clear urine, with virtually no yellow color. They will assume that you've diluted your sample, and they may reject your sample on the basis of color alone.

It's only necessary to start drinking just before the test. Those who drown themselves in fluid days before a test are only causing unnecessary discomfort. Those who stay up all night drinking don't have any better chance than one who drinks heavily first thing in the morning. Get up early if the test is early, but don't lose sleep over a test that's given in the daytime.

Water

Drink at least eight hefty glasses of fluid (preferably water) just prior to the test. Many people start drinking water several days before the drug test; which is useless. Water does not clean any THC metabolites out of your system because THC is not water soluble. Water only dilutes urine temporarily. Do not over do it; you can get water intoxication. People can actually overdose and even die from water intoxication. It's very hard to do, and you'll vomit before anything gets serious.

Creatinine level

Eating red meat will boost creatinine levels. If you eat a lot of red meat for the 3 days prior to the drug test, your creatinine level will be normal, and the lab won't know that you've diluted your urine sample.

Vitamin B

Color your sample yellow by taking 50 to 100 milligrams of vitamin B. Many vitamins will work, but B-2 or B-12 (found in B-complex vitamins) are the most effective, though some will argue that vitamin C is better. This will also help if you plan to dope your sample. This does not guarantee that dilution will work. Diluted samples have been red-flagged when specific gravity and creatinine levels are tested and below normal. If you're taking vitamins at the last minute, check to see if they're time release. If so, crush it up and consume the powder. Coloring your urine isn't all that important because it's normal for people to have clear urine even when they don't consume much fluid.