If you are undergoing a urine test, the first urine sample that is collected is discarded by the medical practitioner because it is more concentrated than the urine collected at other times. The blood and urine tests detect any traces of drugs in your body. The tests are used to test for illicit drug use, alcohol use, diabetes, and other health-related issues. Urine tests are also used to look for evidence of pregnancy, kidney or liver disease, or infections
As you can see, the first urine is more concentrated. It contains more urea, creatinine and potassium than subsequent voids. Also, it has a higher concentration of glucose due to increased water intake during the night or early morning hours.
The medical practitioner discards this sample because he/she wants to make sure that he/she does not get any false results from a highly concentrated sample of urine.
The blood and urine tests detect any traces of drugs in your body.
Drugs can be detected in your body for up to 3 days after use, but it depends on the type of drug you have taken and how much of it was consumed. For example, cocaine and marijuana are detectable for up to three days after consumption while amphetamines are detectable for one week or more.
The time period during which a substance remains detectable varies depending on factors like metabolism rate (how fast your body processes substances), gender differences between users, age at first use (younger people tend not as long), frequency of use (more frequent users may take longer than less frequent ones) etcetera...
The tests are used to test for illicit drug use, alcohol use, diabetes and other health-related issues.
The first urine is discarded because it contains water that the body has not yet processed. This means that there may be more urine in your bladder than you think; if you're dehydrated or have recently consumed a large amount of water (such as after exercising), there could be even more urine in your body than usual! If this happens when taking a drug test at home or elsewhere, it could lead to false positives--and possibly even cause an incorrect diagnosis from your doctor.
Urine tests are also used to look for evidence of pregnancy, kidney or liver disease, or infections.
The main reason why you would get a urine test is because your doctor suspects that you have a urinary tract infection (UTI). UTIs are very common and affect both men and women, but they're more likely to happen in women because they have shorter urethras than men do. A UTI happens when bacteria enter the urinary tract through the urethra or anus and cause an infection in one or both kidneys. The bacteria can then travel up into other parts of your body too--like your bloodstream--and cause serious health problems if left untreated over time.
Urine tests are a routine part of many medical exams. They can be used to detect a wide range of health conditions, including the presence of drugs, alcohol and other substances; pregnancy; kidney or liver disease; diabetes; cancer (in some cases).
Urine tests can also be used as an aid in diagnosing certain diseases that affect the urinary tract such as bladder infections or kidney stones (kidney stones may cause blood in your urine).
The urine test is one of the most common tests that are performed on a regular basis. It can be used to detect several different health issues, including diabetes, kidney disease and pregnancy. If you have been told that you need to take this type of test, then it is important that you know what your doctor expects from the results.