The finding of a 2+ reagent strip reaction for blood in the urine of a patient with severe lower back pain can aid in confirming a diagnosis of:

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A positive 2+ reagent strip reaction for blood in the urine is often seen in patients with renal calculi (kidney stones), which can cause severe lower back pain. Pyelonephritis and multiple myeloma may also present with blood in the urine but are less likely to be associated with severe lower back pain. Appendicitis does not typically involve the urinary tract and would not likely result in blood in the urine.

The Finding of a 2+ Reagent Strip Reaction for Blood