Test sheet for occult blood

A test sheet for occult blood, comprising:

• a permeable substrate layer with water permeability, having a front surface for carrying a biologic sample and a back surface, at least one fold line formed on a middle region of the front surface for folding;
• a test layer with translucency and water permeability, having a front surface and a back surface, the front surface of the test layer attached to the back surface of the permeable substrate layer, the test layer comprising at least one chamber, the chamber having at least two compartments for accommodating a test agent, the at least two compartments separated each other by a separate film, the separate film vertically aligned to the fold line, the test agent comprising a color substance and a redox substance accommodated in the two different compartments, respectively;
• and
• an outer layer with transparency and water impermeability, attached to the back surface of the test layer,
• wherein the redox substance possesses a function of proceeding a redox reaction with an iron-based matter for decomposing and releasing free electrons, the color substance possesses a function of receiving the free electrons released from the redox substance to cause color change, the biological sample is sandwiched by the front surface of the permeable substrate layer after the fold line is folded, the biological sample diffuses into the test layer, the separate film is broken and releases the color substance and the redox substance accommodated in the at least two compartments after the fold line is folded, and the color substance and the redox substance contact and react with the biological sample to cause color change for examining if the biologic sample contains occult blood.

A test sheet for occult blood, comprising:

• a permeable substrate layer with water permeability, having a front surface for carrying a biologic sample and a back surface, at least one fold line formed on a middle region of the front surface for folding;
• a test layer with translucency and water permeability, having a front surface and a back surface, the front surface of the test layer attached to the back surface of the permeable substrate layer, the test layer comprising at least one chamber, the chamber having at least two compartments for accommodating a test agent, the at least two compartments vertically provided on two sides of the fold line, the test agent comprising a color substance and a redox substance accommodated in the two different compartments, respectively, the test layer provided with a plurality of connection passages configured not to cross one another, each connection passage formed by extending the corresponding chamber toward the fold line;
• and
• an outer layer with transparency and water impermeability, attached to the back surface of the test layer,
• wherein the redox substance possesses a function of proceeding a redox reaction with an iron-based matter for decomposing and releasing free electrons, the color substance possesses a function of receiving the free electrons released from the redox substance to cause color change, the biological sample is sandwiched by the front surface of the permeable substrate layer after the fold line is folded, the biological sample diffuses into the test layer, the color substance and the redox substance accommodated in the least two compartments are released and forced to flow and accumulate around the fold line after the fold line is folded;
• and the color substance and the redox substance contact and react with the biological sample to cause color change for examining if the biologic sample contains occult blood.