Benzodiazepines Drug Test
Updated October 16, 2026
Benzodiazepines are prescription sedatives for anxiety and sleep, such as Xanax, Valium, Klonopin, and Ativan.
The Benzodiazepines panel is one of the 14 on every Testr urine drug test, read on site by a certified collector at your door anywhere in the Los Angeles area. On a Testr report it is printed as BZO (Benzodiazepines).
How long do benzodiazepines stay in your system?
That range is typical rather than a guarantee: how much was taken, how often, body weight and hydration all move it.
The screening cutoff above is the level at or above which the on-site cassette reads positive. Below it the panel reads negative even when a trace is present, which is why the cutoff matters as much as the number of days.
Can a prescription cause a positive on the Benzodiazepines panel?
A valid prescription for Xanax, Valium, Klonopin, Ativan or another benzodiazepine can cause a positive, and two unrelated medicines, sertraline (Zoloft) and oxaprozin (Daypro), are documented to cross-react on benzodiazepine screens. Lab confirmation reports the measured level of each compound, and every laboratory report goes to a Medical Review Officer (MRO), a physician who reviews laboratory-confirmed results and accounts for valid prescriptions before the report is released.
What does a positive on the Benzodiazepines drug test panel mean?
The on-site read is a drug screen. It reports positive or negative against the screening cutoff, not a measured level. Laboratory confirmation is what produces a number: a CAP-accredited laboratory quantifies the specimen by LC-MS/MS and reports measured levels, in about 72 hours. Every laboratory report goes to a Medical Review Officer (MRO), a physician who reviews laboratory-confirmed results and accounts for valid prescriptions before the report is released. Confirmation can be added when you book, or from the app within 2 hours of collection, while the specimen is still viable.
Which benzodiazepines the BZO panel covers
The panel screens for the class rather than one medicine, so Xanax, Valium, Klonopin, Ativan and the rest all read on the same strip. How long each stays detectable follows how long it acts.
| Medicine | Generic name | Duration of action | Typical detection window in urine |
|---|---|---|---|
| Halcion | triazolam | very short-acting | 1-3 days, often less |
| Xanax | alprazolam | short-acting | 1-3 days, longer with regular use |
| Ativan | lorazepam | short-acting | 1-3 days, longer with regular use |
| Restoril | temazepam | short-acting | 1-3 days, longer with regular use |
| Klonopin | clonazepam | long-acting | Up to several weeks with regular use |
| Valium | diazepam | long-acting | Up to several weeks with regular use |
| Librium | chlordiazepoxide | long-acting | Up to several weeks with regular use |
What BZO means on the report
What does BZO mean on a drug test?
BZO stands for benzodiazepines. On a Testr report, and on most test cups, this panel is printed as BZO. On a Testr screen the BZO panel reads positive at or above 200 ng/mL, and it is detectable for 1-3 days after short-acting types, up to several weeks with long-acting drugs or regular use.
What is the BZO cutoff on a drug test?
200 ng/mL on a Testr screen: at or above that level the BZO panel reads positive, below it negative. Other cups can print BZO with a different cutoff. Laboratory confirmation applies its own cutoff to each compound it measures and reports the measured level rather than a positive or negative.
Every code on the cassette, with its cutoff and detection window, is on one page: drug test abbreviations, decoded.
More questions about benzodiazepines
Does Xanax show up on a drug test?
Yes. Alprazolam, sold as Xanax, is a benzodiazepine, and the BZO panel screens for the class at a 200 ng/mL cutoff. The on-site screen only reads positive or negative. Every laboratory report goes to a Medical Review Officer (MRO), a physician who reviews laboratory-confirmed results and accounts for valid prescriptions before the report is released.
What does a BZO positive mean on a drug test?
That the specimen read at or above the 200 ng/mL benzodiazepine cutoff on the cassette. It does not say which benzodiazepine or how much. A prescription for one of them is the most common explanation, and sertraline and oxaprozin are documented to cross-react; laboratory confirmation names the compound and its measured level.
How the Testr drug test screens for it
This panel is part of every Testr drug test. A certified collector handles the urine collection at your home, checks specimen temperature, and reads a clinical 14-panel drug screen cassette on the spot. For measured levels rather than a positive/negative read, add laboratory confirmation: a CAP-accredited lab quantifies the result by LC-MS/MS, with measured levels on the report. Testr covers the Los Angeles area seven days a week, 7 AM to 7 PM, with the earliest window 3 hours after you book.