Urine volume hydration test devices
View Patent ↗In accordance with one embodiment of the present disclosure, a method for quantitatively or semi-quantitatively determining the volume of a test sample of urine is provided. The method includes contacting the test sample with a fluidic medium of a lateral flow device having a volume indicator disposed thereon and determining the volume of urine in the test sample based on the distance traveled by the volume indicator along the fluidic medium, the distance traveled by the volume indicator corresponding to the volume of urine in the test sample.
1. A method for quantitatively or semi-quantitatively determining the volume of test sample of urine, the method comprising:
contacting the test sample with a fluidic medium of a lateral flow device, the fluidic medium comprising a volume indicator disposed thereon;
determining the volume of urine in the test sample based on the distance traveled by the volume indicator along the fluidic medium, the distance traveled by the volume indicator corresponding to the volume of urine in the test sample.
2. The method of claim 1 , wherein the volume indicator comprises a luminescent compound, a radioactive compound, a colored dye, a metallic substance, liposomes containing signal-producing substances, or combinations thereof.
3. The method of claim 1 , wherein the fluidic medium further comprises a polyelectrolyte and a pH indicator disposed thereon, the polyelectrolyte capable of an ion-exchange with the urine so as to add hydrogen ions into the urine, the pH indicator capable of producing a signal corresponding to the hydrogen ion concentration in the urine.
4. The method of claim 3 , further comprising determining the ionic strength of the urine based on the signal produced by the pH indicator.
5. The method of claim 3 , wherein the polyelectrolyte comprises poly(acrylic acid), poly(maleic acid), maleic acid vinyl methyl ether copolymer, poly(methacrylic acid), styrenemaleic acid copolymer, maleic anhydride/methylvinylether copolymer, poly(vinylamine), poly(4-vinylpyridine), or combinations thereof.
6. The method of claim 3 , wherein the pH indicator comprises bromothymol blue, thymol blue, phenol red, neutral red, bromophenol blue, methyl orange, alizarine yellow R, or combinations thereof.
7. A method for quantitatively or semi-quantitatively determining the volume and ionic strength of a test sample of urine, the method comprising:
providing a lateral flow device comprising a fluidic medium, the fluidic medium having a volume indicator, a polyelectrolyte, and a pH indicator disposed thereon, the polyelectrolyte capable of an ion-exchange with the urine so as to add hydrogen ions into the urine, the pH indicator capable of producing a signal corresponding to the hydrogen ion concentration in the urine;
contacting the test sample with the fluidic medium of the lateral flow device,
determining the volume of urine in the test sample based on the distance traveled by the volume indicator along the fluidic medium, the distance traveled by the volume indicator corresponding to the volume of urine in the test sample; and
determining the ionic strength of the urine based on the signal produced by the pH indicator.
8. The method of claim 7 , wherein the volume indicator comprises a luminescent compound, a radioactive compound, a colored dye, a metallic substance, liposomes containing signal-producing substances, or combinations thereof.
9. The method of claim 7 , wherein the polyelectrolyte comprises poly(acrylic acid), poly(maleic acid), maleic acid vinyl methyl ether copolymer, poly(methacrylic acid), styrenemaleic acid copolymer, maleic anhydride/methylvinylether copolymer, poly(vinylamine), poly(4-vinylpyridine), or combinations thereof.
10. The method of claim 7 , wherein the pH indicator comprises bromothymol blue, thymol blue, phenol red, neutral red, bromophenol blue, methyl orange, alizarine yellow R, or combinations thereof.
11. The method of claim 7 , wherein the polyelectrolyte is located upstream from the pH indicator.
12. The method of claim 7 , further comprising a sampling zone, the sampling zone configured to receive the test sample of urine.
13. The method of claim 12 , wherein the volume indicator is located in the sampling zone and is upstream from the pH indicator.
14. The method of claim 12 , wherein the polyelectrolyte is located in the sampling zone and is upstream from the pH indicator.
15. The method of claim 7 , further comprising determining the specific gravity of the urine based on the ionic strength.
16. A lateral flow assay device for determining the volume and ionic strength of a test sample of urine, the device comprising a chromatographic medium, the chromatographic medium having a volume indicator, a polyelectrolyte, and a pH indicator disposed thereon;
the volume indicator capable of traveling a distance along the medium that corresponds to the volume of urine in the test sample;
the polyelectrolyte capable of an ion-exchange with the urine so as to add hydrogen ions into the urine; and
the pH indicator capable of producing a signal corresponding to the hydrogen ion concentration in the urine.
17. The lateral flow assay device of claim 16 , wherein the volume indicator comprises a luminescent compound, a radioactive compound, a colored dye, a metallic substance, liposomes containing signal-producing substances, or combinations thereof.
18. The lateral flow assay device of claim 16 , wherein the polyelectrolyte comprises poly(acrylic acid), poly(maleic acid), maleic acid vinyl methyl ether copolymer, poly(methacrylic acid), styrenemaleic acid copolymer, maleic anhydride/methylvinylether copolymer, poly(vinylamine), poly(4-vinylpyridine) or combinations thereof.
19. The lateral flow assay device of claim 16 , wherein the pH indicator comprises bromothymol blue, thymol blue, phenol red, neutral red, bromophenol blue, methyl orange, alizarine yellow R, or combinations thereof.
20. The lateral flow assay device of claim 16 , wherein the volume indicator is located upstream from the polyelectrolyte and the pH indicator.
21. An absorbent article capable of determining the ionic strength of urine comprising:
a substantially liquid impermeable layer;
a liquid permeable layer;
an absorbent core positioned between the substantially liquid impermeable layer and the liquid permeable layer; and
a lateral flow assay device integrated into the article and positioned such that the device is in fluid communication with the urine when provided by a wearer of the article, the device comprising:
a chromatographic medium, the chromatographic medium having a volume indicator, a polyelectrolyte, and a pH indicator disposed thereon;
the volume indicator capable of traveling a distance along the medium that corresponds to the volume of urine in the test sample;
the polyelectrolyte capable of an ion-exchange with the urine so as to add hydrogen ions into the urine; and
the pH indicator capable of producing a signal corresponding to the hydrogen ion concentration in the urine.
22. The absorbent article of claim 21 , wherein the polyelectrolyte comprises poly(acrylic acid), poly(maleic acid), maleic acid vinyl methyl ether copolymer, poly(methacrylic acid), styrenemaleic acid copolymer, maleic anhydride/methylvinylether copolymer, poly(vinylamine) or poly(4-vinylpyridine).
23. The absorbent article of claim 21 , wherein the volume indicator comprises a luminescent compound, a radioactive compound, a colored dye, a metallic substance, liposomes containing signal-producing substances, or combinations thereof.
24. The absorbent article of claim 21 , wherein the pH indicator comprises bromothymol blue, thymol blue, phenol red, neutral red, bromophenol blue, methyl orange, or alizarine yellow R.
25. The absorbent article of claim 21 , wherein the absorbent article defines a window through which the lateral flow assay device is observable.