If i drank beer firday night but prior to that had a full dinner,how long after would alcohol leave my system. If i drank friday nigth and took a urine test on monday at 4:30pm would it be clean?

It depends on the type of test that you have done. A regular urine alcohol test.. the alcohol is out in a matter of hours. The ETG test can detect the smallest amount of ethanol for up to 72 hours. Even if you breathe chemicals that have ethanol in it can cause a positve test.

It depends on the amount you take as well as the function of the kidney.

It depends on the capacity of the kidney to excret aswellas the amount you take

How alcohol cause liver cirhosis

Alcohol is metabolized at the rate of .015 of blood alcohol concentration (BAC) every hour. 1 Thus a person with a very high BAC of .15 will have no measurable alcohol in the bloodstream after ten hours (.15 divided by .015 = 10). Here are some other examples How Long Does Alcohol Stay in Your Urine? | Detox Drug Testing (http://detoxdrugtesting.com/how-long-does-alcohol-stay-in-your-urine/)