Test fluid collection system
The present invention relates generally to methods and materials pertaining to assays, for example immunoassays, for biomarkers in body fluids e.g. blood. The invention also relates to diagnostic or screening methods for infections, and methods of differentiating between infectious and non-infectious conditions in mammals, particularly equines, for monitoring response to anti-infective/antibiotic therapy. The invention further relates to a test fluid collection system adapted to permit dilution and analysis of the collected test fluid. The invention further relates to monitoring exertional rhabdomyolysis in equines, and assay devices for all these things.
1. A test fluid collection system for a collection of metered quantity of a test fluid to be diluted for analysis, the system comprising:
a housing comprising:
i) a collection tip;
ii) a collection port;
iii) a dispensing inlet; and
iv) a dispensing nozzle;
wherein the collection tip is at a first end of the housing and is adapted to contact a sample of the test fluid;
wherein the collection port is proximal to and in fluid communication with the collection tip and comprises two spaced members having opposing hydrophilic surfaces;
wherein said surfaces define a volume between them which corresponds to the metered quantity of test fluid to be collected;
wherein the distance between the spaced members enables the test fluid from the sample tip to be drawn into the volume by capillary action;
wherein the collection tip and dispensing nozzle are at opposite ends of said housing;
wherein the dispensing inlet is proximal to the collection tip, and in fluid communication via a dispensing channel to the dispensing nozzle which runs through said housing;
wherein the housing is adapted to be fitted into the opening of a liquid container containing liquid for diluting the metered quantity of the test fluid, with said collection port and said dispensing inlet within said container, and with a seal fit between said opening and said housing; and
wherein the dispensing channel decreases in diameter between 10-21% over the height of the dispensing nozzle and wherein the dispensing nozzle is flared at the dispensing nozzle exit to dispense drops of the diluted test fluid in a uniform manner from the container when the volume of said container is reduced and the diluted test fluid in said container is forced into said dispensing channel.
2. The system as claimed in claim 1 , wherein the housing has a circular cross-section of circumference between 15 and 20 mm at the widest point.
3. The system as claimed in claim 1 , wherein the collection tip is positioned on a collection stem, which stem incorporates the dispensing inlet and the collection port.
4. The system as claimed in claim 1 , wherein the collection stem is greater than or equal to about 20, 25, 30, 40, 45, or 50 mm length.
5. The system as claimed in claim 1 , wherein the surfaces are parallel or are angled away from each other by about 1°, 2°, 3°, 4°, or 5°.
6. The system as claimed in claim 1 , wherein the surfaces are coated with a hydrophilic coating or an anti-coagulant.
7. The system as claimed in claim 1 , wherein the members are bevelled or shaped to increase surface tension in the volume configured to hold the fluid.
8. The system as claimed in claim 1 , wherein the members are two closely aligned walls which form an open channel.
9. The system as claimed in claim 1 , wherein the housing includes a fitting portion which is adapted to be a push fit into the opening of the container and retained by friction or compression.
10. The system as claimed in claim 1 , wherein the housing includes a fitting portion which is adapted to be a push fit into the opening of the container and retained by friction or compression, and wherein the fitting portion is a cylindrical waist which optionally includes a frusto conical portion which is tapered to facilitate insertion of the fitting portion into the opening of the container.
11. The system as claimed in claim 1 , wherein the collection tip is profiled and dimensioned to allow attachment of a luer end needle, to wick a test fluid sample directly from the sample, or both.
12. The system as claimed in claim 1 , further comprising a liquid container containing liquid for diluting the metered quantity of the test fluid.
13. The system as claimed in claim 1 , wherein the dispensing channel within the dispensing nozzle decreases in diameter by between 20-21% over the height of the dispensing nozzle.