If blood is positive in a urinalysis, what should be done next?

When blood is detected in a urinalysis, the next logical step is to confirm the presence of red blood cells (RBCs) through a microscopic examination of the urine. This confirmation is crucial because the urinalysis can yield positive results for blood without indicating the actual presence of RBCs. A microscopic exam allows for a more definitive assessment, distinguishing between true hematuria (the presence of RBCs) and the presence of hemoglobin or myoglobin from other sources, which might also lead to a positive blood result in the urinalysis.

In cases of hematuria, identifying the quantity and morphology of the RBCs can also provide insight into potential underlying conditions, such as urinary tract infections, kidney stones, or glomerular disease. This step is essential in guiding further diagnostic and therapeutic actions. Hence, confirming the presence of RBCs microscopically is the most appropriate next action following a positive urinalysis for blood.