BAC Urine Test. Urine tests are less accurate than breath and blood tests, and tend to be used only when other tests are not available. Urine testing is also considered an intrusive testing method, similar to blood tests.
https://www.bactrack.com/blogs/expert-center/35043461-three-types-of-bac-testing
If you’re interested in buying a breathalyzer to get a more accurate estimation, I would highly suggest the model listed to the right. If you’re typing in a custom percent alcohol, remember that the proof of an alcohol is double the percent (e.g. 80 proof alcohol is 40%)
http://celtickane.com/projects/blood-alcohol-content-bac-calculator/
Blood Alcohol Concentration & Calculator. Blood Alcohol Concentration (BAC) levels represent the percent of your blood that is concentrated with alcohol. A BAC of .10 means that .1% of your bloodstream is composed of alcohol. Explanation of BAC levels : .020 - Light to moderate drinkers begin to feel some effects.
http://awareawakealive.org/educate/blood-alcohol-content
Blood Alcohol Concentration (BAC) levels represent the percent of your blood that is concentrated with alcohol. A BAC of .10 means that .1% of your bloodstream is composed of alcohol. .080 - Definite impairment of muscle coordination and driving skills. This is the legal intoxication level in most states.
http://awareawakealive.org/educate/blood-alcohol-content
This page will allow you make a calculation for your BAC during a typical drinking occasion. During a typical drinking occasion, how many alcoholic drinks do you consume? Use the table below to determine the percentages for wine and beer, and the proof of various types of hard alcohol. In Step 3, consider the hours you spent from your first sip to when you stopped drinking. Enter how many OUNCES of beer or wine you had and how many SHOTS of liquor you had. Be sure to put a check next to all the values you enter. A can of beer is usually 12 ounces and a glass of wine is usually 4 ounces. The proof of hard alcohol can vary based on brand. Proofs listed on this page are a general proof bar stock; however, this can vary.
http://mcwell.nd.edu/your-well-being/physical-well-being/alcohol/blood-alcohol-concentration/bac-calculator/
1 A breathalyzer or blood test is the only way to have an accurate measurement. 2  This calculator assumes the legal limit for driving is 0.08% and 21 years old. Please note that the legal limit for driving may vary depending on state/country and your age.  All calculations are based on the US Department of Transportation.
http://celtickane.com/projects/blood-alcohol-content-bac-calculator/
1 Everyone is different — BAC calculators are merely an estimate. A breathalyzer or blood test is the only way to have an accurate measurement.  This calculator assumes the legal limit for driving is 0.08% and 21 years old. Please note that the legal limit for driving may vary depending on state/country and your age.
http://celtickane.com/projects/blood-alcohol-content-bac-calculator/
1 If you’re typing in a custom percent alcohol, remember that the proof of an alcohol is double the percent (e.g. 80 proof alcohol is 40%)  If you’re entering a mixed drink, only count the number of shots you put in (not the drink’s total volume)
http://celtickane.com/projects/blood-alcohol-content-bac-calculator/
1 If you’re typing in a custom percent alcohol, remember that the proof of an alcohol is double the percent (e.g. 80 proof alcohol is 40%) 2  If you’re entering a mixed drink, only count the number of shots you put in (not the drink’s total volume)  Everyone is different — BAC calculators are merely an estimate.
http://celtickane.com/projects/blood-alcohol-content-bac-calculator/
Three Types of BAC Testing. In the United States, you are considered to be legally intoxicated and prohibited from driving a vehicle if your blood alcohol content (BAC) is 0.08% or greater. The three most common methods for testing BAC are breath, blood, and urine tests. Many states require a breath test, but some allow you to request a blood or urine test.
https://www.bactrack.com/blogs/expert-center/35043461-three-types-of-bac-testing
what is the blood alcohol level system
Blood Alcohol Concentration levels represent the percent of your blood that is concentrated with alcohol. The blood alcohol level system represent the percent of your blood that is concentrated with alcohol.