4. Detecting Counter Measures
Laboratories know how easy it is to tamper with urine samples and alter the results. Labs often do tests to find out if the sample is legitimate.
If a urine sample looks clear, the lab will suspect that it's watered down. They can't report it as positive, but they may reject the sample and inform your employer that you tried to beat the test. If this happens, the sample might as well be positive, because you won't get hired. Take vitamin B complex to color your urine yellow.
Urine should be between 91 and 97 ° F. NIDA certified labs will verify temperature. If it isn't, they will suspect you added water to the cup, or used substitution. Disposable pocket hand warmers—sold in department stores—will keep a urine sample warm, provided that the urine is in a condom or douche bag.
Creatinine is a substance produced by vertebrates, and it shows up in urine. If someone substitutes their urine with something other than urine, like Mountain Dew, they will test negative for drugs. The testee will most likely not get away with it because Mountain Dew contains zero creatinine, and labs test creatinine levels to ensure that the sample is valid.
Creatinine levels drop below normal when people dilute their urine. This tests to ensure that the subject didn't drink unusual amounts of water. An accurate creatinine "clearance" test would require a urine and blood test 24 hours before the drug test to determine the normal creatinine level for that individual. This is almost never done. You should still be cautious because they do often use the inaccurate method of comparing your creatinine level during the drug test to an average.
Eating foods rich in protein like red meat will slightly increase creatinine levels. There is no significant variation between vegatarians and armavors, so the effect protein has is little. Sexual activity also raises creatinine levels. I doubt sexual activity influences creatinine level with much significance. However, a vegetarian that doesn't have much sex should be concerned. People who are drug-free sometimes lose their jobs for having too low of a creatinine level.
pH is often changed when people spike their sample with household products. Use caution when doping urine, pH is usually tested.
4.5 Specific Gravity
An unusual specific gravity indicates that a sample has been tampered with.
Age can not be tested using urine. There is a rumor that approximate age can be detected in urine, and is tested in medical insurance exams. It's a myth.
Gender cannot be tested either. As with age, there is a rumor that gender can be detected in urine, and is tested in medical insurance exams. It's another myth. It may be argued that a pregnancy test can be used to detect the gender of the urine provider, but the same test is used to detect prostate cancer in males.