Can these named above cause a drug urinalysis to test positive for Amphetamines? For Methamphetamine?
can L-Phenylalanine,L-Tourine,L-Tyrosine or L-Glycine cause a false pos in a urinalysis for Methamph
Added 13 Aug 2009:
The urinalysis was tested for amphetamines, marijuana, and benzo.The test showed a positive for amphetamines then got sent to lab for a more detailed test and showed high numbers for methamphetamine, can the combo of one or all in the question title shown above show the positive outcome or a "false" positive?
15 Aug 2009
Here is some information on substances that can cause false positive results for amphetamines or methamphetamine.
"... Methamphetamine is present in two different forms; “d” and “l”. Street
methamphetamine is predominantly d -Methamphetamine. The over-the-counter
medication, Vick’s Inhaler (and the Walgreen equivalent), contains exclusively the
“l” form of methamphetamine (the listed active ingredient is l-Desoxyephedrine,
another name for l -Methamphetamine). Although it is uncommon, the heavy use of
Vick’s Inhaler can cause a positive urine test for methamphetamine. The claim that
Vick’s Inhaler is the source of a positive methamphetamine test can be checked by
testing for “d” versus “l” methamphetamine. This test is performed by GC/MS.
False Positive Results: The following is a list of prescription and over-the-counter
drugs that can cause false positives for methamphetamine on an immunoassay
screen test (the list is not comprehensive and the following drugs are found in a
large variety of medications).
These drugs will NOT test positive for methamphetamine or amphetamine by LC/MS/MS.
*Mahuang Tea (or tea made from plants belonging to the ephedra family)... "
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