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What do green spots on the blood test pad mean on a urine test strip?

If you find green spots on a bright yellow background on the blood reagent pad of a urine test strip, it means the presence of intact red blood cells in the urine.

The dipstick tests are capable of detecting both intact Red Blood Cells (RBCs) as well as free hemoglobin and myoglobin. Intact RBCs break down and react with the test pad and will result in green spots on yellow or orange background. The concentration of green spots is typically linked to the number of RBCs. Free hemoglobin and myoglobin produce a uniform green or green to dark blue color.

If you find green spots on the reagent pad for blood, consult with a physician about your findings and seek a professional diagnosis.

Also, you may find the following recommendations helpful:

  • Repeat the tests to arrive at consistent conclusions.
  • Please note that contaminants on the non-sterile containers may interact with the chemicals on the test pads and produce erroneous results, so it is recommended to use sterile containers for specimen collection.
  • The result should be read at 60 seconds after wetting the strip.

Source: Lillian Mundt, “Graff’s Textbook of Urinalysis and Body Fluids 3rd Edition (2016, Wolters Kluwer)

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