UriSub®
Liquid, Protein-Free Serum Substitute For use in Manufacturing Clinical
Chemistry and Immunological Standards and Controls. This product has
been proven effective for use with drugs of abuse and pregnancy (HCG),
eliminating the need for lyophilization while stabilizing the product at
room temperature. Analyte Recovery is close to 100%.
Other uses include: Testing materials for urine contamination; Used for
diaper and incontinence product development; and, car seat protection.
INTRODUCTION AND BACKGROUND
Urine is a liquid waste product of the body. A healthy person’s urine is amber
colored and slightly acid. Normal urine has a specific gravity of 1.022. The major
components of the urine are water, urea, creatinine, uric acid, and inorganic salts. The
inorganic salts include, sodium, potassium, ammonia, calcium and magnesium.
The condition of urine is often an indication of a person’s health. In addition to
normal contents described above, urine carries drug metabolities, certain hormones,
reproductive hormones and steroids.
Urine analysis is very popular in determining the concentration of drugs of abuse,
therapeutic drugs and plegnancy.
Urinalysis is preferred by doctors in lieu of blood samples. This created a problem for
the manufacturer when he had to obtain large quantities of urine to make controls,
standards and calibrants to assure the accuracy of the results.
Most manufacturers of urine assay kits depend on their employees to donate urine
samples. These urine samples are then combined to make a large pool, which then has to be
treated before controls can be manufactured.
Obtaining a large pool of consistent quality is difficult primarily because the
majority of donors are either coffee drinkers, on medication, or take vitamins, and/or
other commonly used drugs such as aspirin.
Urine also has a bad connotation and the odor makes it a component that most chemists
do not like to work with.
To solve the problem of obtaining a consistent quality of urine and also odorless, CST
has developed a patented product, UriSub®
UriSub®, a newly developed synthetic urine, has all the characteristics of urine, such
as osmolality, specific gravity and pH. In addition, it is stable at room temperature for
at least three years. This offers the manufacturer of urine assay kits the optimal
alternative solution to the problems of matrix compatibility.
FORMULATIONS AND PROPERTIES
UriSub® is a synthetic buffered solution which is physically equivalent to normal
urine with respect to:
-
Specific Gravity
-
Viscosity
-
Osmolality
It has no odor, unlike normal urine.
UriSub® contains a preservative which is both bacteriostatic and bactericidal.
UriSub® contains no azide or thimerosal.
SUBSTANTIAL EQUIVALENCY DATA
UriSub® has been used to demonstrate its equivalency in several commercial products.
Among these are:
-
Drugs of Abuse
-
Therapeutic Drugs
-
Reproductive Hormones
-
Some Steroids
REGULATORY COMPLIANCE
UriSub® is a synthetic urine for use as a component in preparing standards and
controls for in-vitro diagnostic tests. UriSub® should be treated as any other component
or ingredient that has to be qualified prior to use. UriSub®, when used in this manner,
does not require FDA approval for its use. A Device Master File for UriSub® is pending.
UriSub®) is manufactured under the strictest quality control guidelines to ensure quality
and lot to lot uniformity.
USER’S GUIDELINES
Among the currently demonstrated applications for UriSub® are:
- Urine positive and negative controls
- Calibrators
- Urine substitute for making controls and standards
HOW TO PREPARE THE ANALYTE FOR SPIKING
How to prepare positive control or reference standards.
Prepare a concentrated solution of the analyte to be spiked in an aqueous or organic
solvent. If an organic solvent is used, use the least possible amount of solvent for
solution and spiking purposes. This will assure that UriSub® will remain effective.
|
RATIONALE |
|
Human
Urine |
|
UriSub® |
|
YES |
Lot to lot variability |
NO |
|
YES |
Unpleasant odor |
NO |
|
YES |
Costly processing, column purification
prior to use |
NO |
|
YES |
Unpredictable availability |
NO |
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|
