Doctor insights on:
How Accurate Is A Urine Drug Test
Urine is the product of the kidneys, which is produced to eliminate the waste products of metabolism, manage body fluid balance, &maintain acid-base balance. The blood is first filtered by the kidneys, and the composition of the resulting fluid is then altered depending on the body's needs. It is composed of mostly water, and breakdown products from blood cells impart ...Read more
Prostate Testing: It is all about the context in which the test is done, the history of the patient and the previous psa tests done with his aging. It is not a stand alone test but can be reassuring or prompt another look. I offer it to my male patients over 40. ...Read more
Lab error: Sadly, these tests are not perfect. A good honest pathologist and a good lawyer may be what you need. ...Read more
Alcohol metabolite: The common alcohol urine test examines the urine for a metabolite of alcohol, ethyl glucronide. It can be detected up to five days after intake of alcohol, so called 80 hour test. It is accurate and may be too accurate in that the result may be positive for using alcohol gel for hand sanitation. ...Read more
Is it possible to get a false negative for marijuana on a doctors office drug test? At home drug test shows positive
Possible: Any test can give a false positive or false negative result. If you do weed, you know the true state and do not need to test. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex, if you have sex. ...Read moreSee 1 more doctor answer
Depends: There is growing research and developments in using saliva to test for a multitude of conditions and diseases going on right now. There are saliva tests for diabetes, oral cancer, hiv, caries susceptibility (cavity risk), and more. But urine is still valuable for diagnostic testing and i don't think it is going away. ...Read moreSee 1 more doctor answer
Blood pregnancy: test is the gold standard.Get a more detailed answer ›
Probably OK: Shelf life of many products is determined by how long they were tested. One month after the expiration the product is still probably ok. ...Read more
How accurate is NAAT urine tests for chalmdyia and is it possible to get two false negatives in a row?
Testing: The negative predictive value of chlamydia NAAT urine tests are in the 99% range. This means that a negative test very likely indicates that there is no disease. 2 negative tests are even more likely to indicate that there is no disease. Nothing is impossible, but it would be HIGHLY unlikely that there would be 2 false negatives in a row. ...Read more
Drug testing: The key issue for sensitivity is the method of detection, and the physiology of the drug in the body. Many drugs are metabolized or excreted through the urine and thus tend to be concentrated in urine samples that are tested by lateral flow immunoassay. Blood testing by Mass Spec is also highly sensitive but not as widely available. ...Read more
Cocaine urine test: Infrequent users: 3-4 days; heavy users: 10 days; chronic users and/or users with high body fat: 30 days. Depends on several factors as you can see. This is where Cocaine use gets really expensive. Can you afford it now? Why play russian roulette with your future. See a psychiatrist who specializes in substance abuse. New study shows topiramate works quite well in cutting down cravings and use. ...Read moreSee 1 more doctor answer
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