EP0095302A1
Expired / Lapsed
EP
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Improved specimen slide for occult blood testing
Assignee: SmithKline Diagnostics Inc
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Filing: 1983-05-17
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Granted: —
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Expires: 2003-05-17
Abstract
Abstract A method and novel absorbent substrate for determining the presence of occult blood in gastric fluid. The substrate is acid treated and contains guaiac. The method includes the addition of the gastric fluid to the acid treated guaiac substrate which is developed with a buffered developing solution. Preferably the substrate is an acid treated sheet of absorbent paper and the developing solution is an aqueous buffered solution of hydrogen peroxide.
Inventors
- 👤 Josefina Tecson Baker
- 👤 Paul Joseph Lawrence
- 👤 Charles William Townsley
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 23:38
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/72; G01N33/721; G01N33/726
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
20 words
A specimen test slide for testing occult blood comprising an acid treated absorbent substrate containing guaiac as a test reagent.
Claim 2
Dependent Claim
20 words
A specimen test slide for testing occult blood comprising an acid treated absorbent substrate containing guaiac as a test reagent.
Claim 3
Dependent Claim
14 words
The slide of Claim 1 wherein the substrate comprises a sheet of absorbent paper.
Claim 4
Dependent Claim
11 words
The slide of Claim 1 wherein the acid is citric acid.
Claim 5
Independent Claim
44 words
A method of testing for occult blood in gastric fluid which comprises applying the gastric fluid to an acid treated absorbent substrate containing guaiac as a reagent and applying a buffered developing solution to said substrate and observing if the substrate is colored blue.
Claim 6
Independent Claim
44 words
A method of testing for occult blood in gastric fluid which comprises applying the gastric fluid to an acid treated absorbent substrate containing guaiac as a reagent and applying a buffered developing solution to said substrate and observing if the substrate is colored blue.
Claim 7
Dependent Claim
12 words
The method of Claim 4 wherein the developing solution contains hydrogen peroxide.
Claim 8
Dependent Claim
41 words
A test kit for determining the presence of occult blood in gastric fluid which comprises an acid treated absorbent substrate containing, guaiac reagent and a receptacle containing a buffered developing solution which reacts with said reagent to color the substrate blue.
Claim 9
Dependent Claim
41 words
A test kit for determining the presence of occult blood in gastric fluid which comprises an acid treated absorbent substrate containing, guaiac reagent and a receptacle containing a buffered developing solution which reacts with said reagent to color the substrate blue.
Claim 10
Dependent Claim
27 words
An aqueous developing solution comprising from about 1% to about 5% of hydrogen peroxide buffered by 0.2 M citric acid/sodium citrate having a pH of about 5.8.
Claim 11
Dependent Claim
27 words
An aqueous developing solution comprising from about 1% to about 5% of hydrogen peroxide buffered by 0.2 M citric acid/sodium citrate having a pH of about 5.8.
Claim 12
Dependent Claim
11 words
The solution of Claim 7 wherein a nonionic detergent is added.
References Cited (Backward Citations)
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