Urine sample adulteration is serious problem in forensic urine drug testing. Sample adulteration is usually achieved by substitution, dilution or the addition of adulterants including so called "masking agents" sold commercially. Adulteration is defined as the tampering or manipulation of a urine specimen with the intention of altering the test results. The use of adulterants can cause false negative results in drug tests by either interfering with the screening test and/or destroying the drugs present in the urine. Dilution may also be employed in an attempt to produce false negative drug test results. Clinically, the accepted method to test for adulteration or dilution is to determine certain urinary characteristics such as creatinine, pH, and specific gravity and to detect the presence of glutaraldehyde, nitrite and oxidants /pyridinium chlorochromate (PCC) in urine.
The One Step S.V.T. strip is a semi quantitative, color comparison screen for the detection of creatinine, nitrite, glutaraldehyde, pH, specific gravity, and oxidants/pyridinium chlorochromate (PCC) in human urine. The test is intended as a point of testing adulterant pre-screen test of urine samples prior to further testing. The One Step S.V.T. test will detect for all the commonly used methods of sample manipulation and adulteration including dilution, substitution, chemical additives and the so called commercially available "cleansing agents". Each of the plastic strips contains six (6) chemically treated reagent pads. One (1) minute following the activation of the reagent pads by the urine sample, the colors that appear on the pads can be compared with the printed color chart on the canister. The color comparison provides a semi quantitative screen for creatinine, nitrite, glutaraldehyde, pH, specific gravity, and oxidants/pyridinium chlorochromate (PCC) in human urine which can help assess the integrity of the urine sample prior to further testing.
Creatinine is a waste
product of creatine; an amino acid contained in muscle tissue and found in
urine. A person may attempt to foil a drug test by drinking excessive amounts of
water or diuretics such as herbal teas to "flush" the system. Creatinine and
specific gravity are two ways to check for dilution and flushing, which are the
most common mechanisms used in an attempt to circumvent drug testing. Low
creatinine and specific gravity levels may indicate diluted urine. The absence
of creatinine (<5mg/dl) is indicative of a specimen not consistent with human
The test is based on the color derived from the chemical reaction between the chemical reagent on each test pad and the urine sample. A color chart (shown above) indicating abnormal and normal test result color values for each of the six parameters tested is printed on the test container. One test strip is dipped in the urine sample for 1-2 seconds immersing all reagent test pads. The strip is then blotted on its side to remove excess sample. After one (1) minute the colors of the six reagent pads are visually compared to the color chart and results obtained for each of the six test parameters. An abnormal result for any of the six parameters suggests the sample has been manipulated, altered or otherwise contaminated and a new sample should be obtained for further testing.
The One Step Urine Specimen Validity Test for adulterants in urine samples is available in sealed vials containing 25 test strips. Each vial includes complete testing instructions, technical details and background information on the test procedure. Volume sales units are indicated in the table below.
specimen collection containers available separately:
Professional specimen collection containers available separately: Specimen Containers