Expert Lab Testing


You can choose to send your First Check® Home Drug Test sample to our state-of-the-art test laboratory for further analysis at no charge.

Staffed by toxicology professionals using the most sophisticated equipment and technology available, the lab provides the most accurate drug test results possible and delivers answers with absolute discretion.

How the Lab Analyzes Drug Test Urine Samples

  • Every day, the laboratory processes over 70,000 urine specimens.

  • Each First Check® Home Drug Test sample the lab receives is sorted by test type and its nine-digit confidential confirmation number is recorded in the lab's Automated Results Program. Test results are made confidentially available 24 hours a day, seven days a week by phone or online.

  • Lab technicians use a sophisticated instrument called Gas Chromatography/Mass Spectrometry or GC/MS for short to test the samples. GC/MS is considered the gold standard in laboratory testing for most drugs. This technology employs two different methods of chemical analysis to identify and measure drug substances present in the urine sample.

  • The Gas Chromatography (GC) portion of the instrument separates the complicated chemical mixture found in the urine sample into pure chemicals based on the speed at which the chemicals turn into a gas. Some drug chemicals (usually smaller molecules) turn into gas more quickly than other chemicals (those made of larger molecules).

  • Next, the Mass Spectrometer (MS) portion of the instrument identifies specific drug chemicals based on their structure, determining the molecular weight of the chemicals identified during the Gas Chromatography process. An ion source bombards the urine sample's molecules with electrons, breaking them apart and turning them into positively charged ions. These ions are passed through an electromagnetic filter which sorts the particles based on their molecular weight. A detector counts the number of ions with each specific mass and feeds this data into a computer.

  • The GC/MS process produces a detailed report of the chemicals found in the urine sample, even listing the number of nanograms of each compound present in the sample.

  • All negative tests showing no drugs present are entered into the Automated Results Program.

  • All positive test results showing the presence of drugs are sent to the lab's Chief Toxicologist for review, after which they are also entered into the Automated Results Program.

  • Positive samples are reported with a nanogram per milliliter (ng/ml) level. This level is not available through the Automated Results Program, but First Check customers may call 1-888-788-5716 to speak with a First Check Customer Service Representative, who will disclose these levels.

  • The nanogram level cannot tell you how much of a drug was used nor will it indicate a time frame as to when a drug was used. It may be helpful, however, in monitoring a chronic or everyday user of marijuana to determine when the drug is leaving the system.

Before taking the test, users must read all of the content in the package insert.

Drug Test FAQs

Browse some of the most frequently asked questions about First Check® Home Drug Tests.