According to Forensic Fluids Laboratories, oral swab drug tests are up to 60 percent more sensitive to cocaine, opiates and methamphetamines than urine-based instant tests. This drastically reduces the number of false negative results. Forensic Fluids Laboratories cites a study from the Journal of Analytical Toxicology, which demonstrates that the urine tests produce false-negative results up to twice as often as mouth swab tests.Continue Reading
One key difference between the two types of tests involves detecting THC, the active chemical in marijuana. Forensic Fluids Laboratories reports that mouth swabs are capable of detecting use up to 72 hours after the drug was used. By contrast, urine tests often detect THC in samples up to 120 hours after the drug was used. MedicalHealthTests.com adds that the efficacy of the tests may vary widely, as no certification or consistent protocols are in place to guide the testing process.
MedicalHealthTests.com explains that brushing, flossing and practicing oral hygiene may cause the mouth swab test to generate a false negative. A 2006 study, published in Clinical Biochemist Reviews, found that ingesting alcohol immediately after ingesting marijuana temporarily rinses the mouth and produces false negatives. The study’s authors suggest water may have a similar effect. The authors indicate that testing 15 to 20 minutes after such rinsing produces more accurate results.Learn more about Diagnostics & Imaging
During a standard medical exam, the physician records vital signs, listens to the heart and lungs, looks in the patient's mouth, physically feels the abdomen, and tests reflexes, according to WebMD. The physician also takes a health history and assesses the patient's general physical appearance. If the patient is male, the physician also examines external genitals and examines the prostate rectally. If the patient is female, the doctor checks the breasts and does a pelvic exam.Full Answer >
Quest Diagnostics offers a variety of diagnostic clinical lab testing, including blood tests, body fluid testing, tissue pathology and cytology, health screening tests, and drug screening. Quest Diagnostics also offers genetic testing. Health care providers, government agencies and employers may order testing through Quest Diagnostics, according to the company's website.Full Answer >
Synthetic human urine is often used for the purpose of defeating drug tests, according to the American Association for Clinical Chemistry. Synthetic urine is also used for calibration of laboratory equipment and as part of pranks and sexual fetish practices, explains XStream Novelty World Products.Full Answer >
Itching from oxycodone is induced by opiates found within the drug, according to Phys.org. The opioids contain a variant called MOR1D that initiates itching in patients when communicating with a receptor in the body known as GRPR.Full Answer >