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Commonly used baby soaps and shampoos, including products from Johnson & Johnson, Aveeno and CVS, can trigger a positive result on newborns' marijuana screening tests, according to a recent study. A minute amount of the cleansing products in a urine sample — just 0.1 milliliters or less — was found to cause a positive result.
Researchers at the University of North Carolina, Chapel Hill, began studying the issue after an unusually high number of newborns in their nursery began testing positive for marijuana exposure. Newborn screening for marijuana at hospitals, particularly among babies of women who are considered at high risk of drug use, is not uncommon: at U.N.C. Chapel Hill, 10% to 40% of newborns are tested.
Positive results can precipitate an investigation by child welfare authorities. "We really did this to help protect families from being falsely accused," study co-author Dr. Carl Seashore, a pediatrician in the U.N.C. Chapel Hill newborn nursery, told My Health News Daily.
(LIST: 10 reasons to revisit marijuana policy now)
Soaps that were specifically associated with false-positive marijuana test results include Johnson & Johnson’s Bedtime Bath, CVS Night-Time Baby Bath, Aveeno Baby Soothing Relief Creamy Wash and Aveeno Baby Wash & Shampoo.
Other products, such as Johnson’s Head-to-Toe Baby Wash, CVS Baby Wash, Baby Magic and even standard hospital gel hand soap, also indicated the presence of marijuana metabolites when tested, but not at sufficient levels to qualify as a positive result according to the hospital lab's standards.
The problem is almost certainly not limited to these products, however. Researchers also tested ingredients used widely in soaps and shampoos, including polyquaternium-11 and cocamidopropyl betaine, which both elicited positive marijuana test results. So far, there is no explanation as to why the chemicals interfere with the test's function, but importantly, they aren't intoxicating; they don't cause symptoms of marijuana exposure in children. The researchers think minute amounts of the substances were simply washing off the babies' skin into their urine samples and confounding the screens.
While more sophisticated and expensive testing can easily distinguish between true and false positive results, most hospitals don't use such tests because of the time and costs involved. And positive tests found at the hospital aren't typically sent to outside labs for confirmation, which makes false positive results — and possible investigations afterward — all the more troubling.
Indeed, why hospitals test infants for marijuana exposure in the first place is not entirely clear. Twelve U.S. states designate prenatal exposure to any illegal drug as child abuse; however, there is no scientific evidence that connects marijuana-smoking by a parent with abuse
.
Commonly used baby soaps and shampoos, including products from Johnson & Johnson, Aveeno and CVS, can trigger a positive result on newborns' marijuana screening tests, according to a recent study. A minute amount of the cleansing products in a urine sample — just 0.1 milliliters or less — was found to cause a positive result.
Researchers at the University of North Carolina, Chapel Hill, began studying the issue after an unusually high number of newborns in their nursery began testing positive for marijuana exposure. Newborn screening for marijuana at hospitals, particularly among babies of women who are considered at high risk of drug use, is not uncommon: at U.N.C. Chapel Hill, 10% to 40% of newborns are tested.
Positive results can precipitate an investigation by child welfare authorities. "We really did this to help protect families from being falsely accused," study co-author Dr. Carl Seashore, a pediatrician in the U.N.C. Chapel Hill newborn nursery, told My Health News Daily.
(LIST: 10 reasons to revisit marijuana policy now)
Soaps that were specifically associated with false-positive marijuana test results include Johnson & Johnson’s Bedtime Bath, CVS Night-Time Baby Bath, Aveeno Baby Soothing Relief Creamy Wash and Aveeno Baby Wash & Shampoo.
Other products, such as Johnson’s Head-to-Toe Baby Wash, CVS Baby Wash, Baby Magic and even standard hospital gel hand soap, also indicated the presence of marijuana metabolites when tested, but not at sufficient levels to qualify as a positive result according to the hospital lab's standards.
The problem is almost certainly not limited to these products, however. Researchers also tested ingredients used widely in soaps and shampoos, including polyquaternium-11 and cocamidopropyl betaine, which both elicited positive marijuana test results. So far, there is no explanation as to why the chemicals interfere with the test's function, but importantly, they aren't intoxicating; they don't cause symptoms of marijuana exposure in children. The researchers think minute amounts of the substances were simply washing off the babies' skin into their urine samples and confounding the screens.
While more sophisticated and expensive testing can easily distinguish between true and false positive results, most hospitals don't use such tests because of the time and costs involved. And positive tests found at the hospital aren't typically sent to outside labs for confirmation, which makes false positive results — and possible investigations afterward — all the more troubling.
Indeed, why hospitals test infants for marijuana exposure in the first place is not entirely clear. Twelve U.S. states designate prenatal exposure to any illegal drug as child abuse; however, there is no scientific evidence that connects marijuana-smoking by a parent with abuse
.
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