Hello from JustAnswer.
The drug testing that is to be done uses an initial immunoassay screening test and only does a confirmatory test when an initial screening test is positive. The immunoassay for benzodiazepines is oriented towards oxazepam or nordiazepam, because many different benzodiazepines are metabolized into oxazepam or nordiazepam, including Valium and Librium
. However, the lorazepam does not get metabolized into oxazepam or nordiazepam, so it will frequently be missed by the screening test for benzodiazepines. There is a small amount of cross-reactivity, particularly at high concentrations, but it will frequently yield a negative result.
The confirmatory test, though, will readily detect lorazepam, as well as other benzodiazepines. So, if there is a positive result, there will automatically be a confirmatory test, and that can detect the lorazepam.
Within that context, the lorazepam is an intermediate acting benzodiazepine, so can typically be detected for up to 5 days. In addition, there is nothing that will accelerate clearance of the drug. Drinking plenty of water may help from the perspective of decreasing the concentration in the urine, because any test will only detect drugs above a certain threshold, and drinking water may help get the concentration below the threshold for detection. Drinking too much water also can be an issue, as urine that is too dilute would also raise red flags.
So, there is a good chance that the urine test will not detect the recent use of lorazepam, but drinking a good amount of water before testing would be the only intervention that may help make it even less likely.
If I can provide any further information, please let me know.