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Methamphetamine Test Device
A rapid, one step test for the qualitative detection of Methamphetamines in human urine.
For healthcare professionals including professionals at point of care sites
For professional in vitro diagnostic use only.
The MET One Step Methamphetamine Test Device is a lateral flow chromatographic immunoassay for the detection of Methamphetamines in human urine.
This assay provides only a preliminary analytical test result. A more specific alternate chemical method must be used in order to obtain a confirmed analytical result. Gas chromatography/mass spectrometry (GC/MS) is the preferred confirmatory method. Clinical consideration and professional judgment should be applied to any drug of abuse test result, particularly when preliminary positive results are used.
Methamphetamine is an addictive stimulant drug that strongly activates certain systems in the brain. Methamphetamine is closely related chemically to amphetamine, but the central nervous system effects of Methamphetamine are greater. Methamphetamine is made in illegal laboratories and has a high potential for abuse and dependence. The drug can be taken orally, injected, or inhaled. Acute higher doses lead to enhanced stimulation of the central nervous system and induce euphoria, alertness, reduced appetite, and a sense of increased energy and power. Cardiovascular responses to Methamphetamine include increased blood pressure and cardiac arrhythmias. More acute responses produce anxiety, paranoia, hallucinations, psychotic behavior, and eventually, depression and exhaustion.
The effects of Methamphetamine generally last 2-4 hours and the drug has a half-life of 9-24 hours in the body. Methamphetamine is excreted in the urine primarily as amphetamine and oxidized and deaminated derivatives. However, 10-20% of Methamphetamine is excreted unchanged. Thus, the presence of the parent compound in the urine indicates Methamphetamine use. Methamphetamine is generally detectable in the urine for 3-5 days, depending on urine pH level.
The One Step Drug Screen Test Card yields a positive result when the Methamphetamine in urine exceeds 1,000 ng/mL.
The MET One Step Methamphetamine Test Device is a rapid chromatographic immunoassay based on the principle of competitive binding. Drugs which may be present in the urine specimen compete against the drug conjugate for binding sites on the antibody.
During testing, a urine specimen migrates upward by capillary action. Methamphetamines, if present in the urine specimen below 1,000 ng/mL, will not saturate the binding sites of the antibody coated particles in the test device. The antibody- coated particles will then be captured by immobilized Methamphetamine conjugate and a visible colored line will show up in the test line region. The colored line will not form in the test line region if the Methamphetamine level exceeds 1,000 ng/mL because it will saturate all the binding sites of anti-Methamphetamine antibodies.
A drug-positive urine specimen will not generate a colored line in the test line region because of drug competition, while a drug-negative urine specimen or a specimen containing a drug concentration less than the cut-off will generate a line in the test line region.
To serve as a procedural control, a colored line will always appear at the control line region, indicating that proper volume of specimen has been added and membrane wicking has occurred.
The test device contains mouse monoclonal anti-Methamphetamine antibody-coupled particles and Methamphetamine-protein conjugate. A goat antibody is employed in the control line system.
Store as packaged in the sealed pouch at 2-30°C. The test device is stable through the expiration date printed on the sealed pouch. The test device must remain in the sealed pouch until use. DO NOT FREEZE. Do not use beyond the expiration date.
The urine specimen must be collected in a clean and dry container. Urine collected at any time of the day may be used. Urine specimens exhibiting visible particles should be centrifuged, filtered, or allowed to settle to obtain clear specimen for testing.
Urine specimens may be stored at 2-8°C for up to 48 hours prior to assay. For long-term storage, specimens may be frozen and stored below -20°C. Frozen specimens should be thawed and mixed before testing.
Materials Required But Not Provided
Allow the test device, urine specimen, and/or controls to reach room temperature (15-30ºC) prior to testing.
(Please refer to the illustration above)
NEGATIVE:* Two lines appear. One colored line should be in the control region (C), and another apparent colored line should be in the test region (T). This negative result indicates that the Methamphetamine concentration is below the detectable level (1,000 ng/mL).
* NOTE: The shade of color in the test line region (T) will vary, but it should always be considered as negative whenever there is even a faint line.
POSITIVE: One colored line appears in the control region (C). No line appears in the test region (T). This positive result indicates that the Methamphetamine concentration exceeds the detectable level (1,000 ng/mL).
INVALID: Control line fails to appear. Insufficient specimen volume or incorrect procedural techniques are the most likely reasons for control line failure. Review the procedure and repeat the test using a new test device. If the problem persists, discontinue using the lot immediately and contact your local distributor.
A procedural control is included in the test. A colored line appearing in the control region (C) is considered an internal procedural control. It confirms sufficient specimen volume, adequate membrane wicking and correct procedural technique.
Control standards are not supplied with this kit; however it is recommended that positive and negative controls be tested as good laboratory practice to confirm the test procedure and to verify proper test performance.
A side-by-side comparison was conducted using the MET One Step Methamphetamine Test Device and a leading commercially available MET rapid test. Testing was performed on 300 clinical specimens. Ten percent of the specimens employed were either at –25% or +25% level of the cut-off concentration of 1,000 ng/mL Methamphetamine. Presumptive positive results were confirmed by GC/MS. The following results were tabulated:
|Method||Other MET Rapid Test||Total Results|
|MET One Step Test Device||Results||Positive||Negative|
|% Agreement with this commercial kit||96%||>99%||98%|
When compared at 1,000 ng/mL cut-off with GC/MS, the following results were tabulated:
|MET One Step Test Device||Results||Positive||Negative|
|% Agreement with GC/MS Analysis||96%||95%||95%|
Eighty (80) of these sMETles were also run using the MET One Step Methamphetamine Test Device by an untrained operator at a different site. Based on GC/MS data, the operator obtained a statistically similar Positive Agreement, Negative Agreement and Overall Agreement rate as the laboratory personnel.
A drug-free urine pool was spiked with Methamphetamine at the following concentrations: 0 ng/mL, 500 ng/mL, 750 ng/mL, 1,000 ng/mL, 1,250 ng/mL and 1,500 ng/mL. The result demonstrates >99% accuracy at 50% above and 50% below the cut-off concentration. The data are summarized below:
|MET Concentration (ng/mL)||Percent of Cutoff||n||Visual Result|
The following table lists compounds that are positively detected in urine by the MET One Step Methamphetamine Test Device at 5 minutes.
A study was conducted at 3 physician’s offices by untrained operators using 3 different lots of product to demonstrate the within run, between run and between operator precision. An identical panel of coded specimens containing no Methamphetamine, 25% Methamphetamine above and below the cut-off and 50% Methamphetamine above and below the 1,000 ng/mL cut-off was provided to each site.
|Methamphetamine concentration (ng/mL)||n||Site A||Site B||Site C|
Effect of Urinary Specific Gravity
Fifteen (15) urine sMETles of normal, high, and low specific gravity ranges were spiked with 500 ng/mL and 1,500 ng/mL of Methamphetamine respectively. The MET One Step Methamphetamine Test Device was tested in duplicate using the fifteen neat and spiked urine sMETles. The results demonstrate that varying ranges of urinary specific gravity does not affect the test results.
Effect of the Urinary pH
The pH of an aliquoted negative urine pool was adjusted to a pH range of 5 to 9 in 1 pH unit increments and spiked with Methamphetamine to 500 ng/mL and 1,500 ng/mL. The spiked, pH-adjusted urine was tested with the MET One Step Methamphetamine Test Device in duplicate. The results demonstrate that varying ranges of pH does not interfere with the performance of the test.
A study was conducted to determine the cross-reactivity of the test with compounds in either drug-free urine or Methamphetamine positive urine. The following compounds show no cross-reactivity when tested with the MET One Step Methamphetamine Test Device at a concentration of 100 mg/mL.
Non Cross-Reacting Compounds
|Codeine||Tetrahydrocortisone, 3 Acetate|
|(-) Cotinine||Tetrahydrocortisone 3 (b-D glucuronide)|
|(-) Y Ephedrine||d,l-Octopamine||Uric acid|
Span Biotech Ltd. is a research based company for rapid tests, with strong support from National Key Laboratory of Technology Projects of 10th and 11th Five-Year Plan and Faculty of Life Sciences of HuBei University. SpanBio also housed a R&D team that is developing gene recombination, cell cultivation and protein purification techniques. SpanBio pays strict attention on rapid tests for human being, animal diseases and food safety detection. It provides a number of customized services to professional distributors and partnering affiliates with excellent quality, competitive prices and super service.
Contact Person: Ms. Anna Lee