Drug test Morphine opiates (immunological) (GC-MS qualitative) urine
The following substances are tested:
- opiates (e.g. codeine, morphine)
When asked whether an offered sample is urine, diluted urine or no urine, creatinine should be included in the determination.
Strangely enough there are no accepted reference values for creatinine in urine. Recently, the Dutch expert group on drug analysis (consisting of LJ Mostert, RJM Niesink, EJM Pennings, DRA Uges, JP Weijers-Everhard, FA de Wolff, RA de Zeeuw, PGM Zweipfenning, and ACG Egberts), also considered the question of what the cut-off value for creatinine in urine in drug testing should be. After reviewing all available data, they decided to recommend that 2 mmol/l be accepted as the minimum value. With a value lower than 2 mmol/l and a negative result for drugs it should be reported that the sample in question has no informative value for the drug test in question. If the result is positive, it can of course simply be used.
Someone can not just be punished on the basis of a creatinine content < 2 mmol/l. The specificity of this cut-off value is insufficient. It is important to recommend that morning urine be taken. In practice, however, this is not always feasible.