A spotted reaction on the reagent strip reaction for blood can indicate:

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A spotted reaction on the reagent strip reaction for blood indicates the presence of intact red blood cells in the urine, which is known as hematuria. Hemoglobinuria, myoglobinuria, and porphyrinuria can also cause a positive blood reaction on the strip, but they are not typically associated with a spotted reaction. Hemoglobinuria can occur due to the breakdown of red blood cells, myoglobinuria can result from muscle injury, and porphyrinuria can be seen in cases of porphyria.

A Spotted Reaction on the Reagent Strip Reaction for Blood