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Interpretive Handbook

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Test 60040 :
Methaqualone, Urine

Clinical Information Discusses physiology, pathophysiology, and general clinical aspects, as they relate to a laboratory test

Methaqualone is a sedative hypnotic drug that is not available in the United States as a prescription drug. It has also been used illegally as a recreational drug, commonly known as quaaludes (particularly in the 1970s in North America).


The biologic half-life is 20 to 60 hours, and is detectable in urine for 4 to 6 days after use.

Useful For Suggests clinical disorders or settings where the test may be helpful

Detecting drug abuse involving methaqualone

Interpretation Provides information to assist in interpretation of the test results

The presence of methaqualone in urine at >100 ng/mL indicates use of this drug.

Reference Values Describes reference intervals and additional information for interpretation of test results. May include intervals based on age and sex when appropriate. Intervals are Mayo-derived, unless otherwise designated. If an interpretive report is provided, the reference value field will state this.


Positives are reported with a quantitative GC-MS result.

Cutoff concentrations:


<300 ng/mL



<100 ng/mL