What is a common reason to collect an additional specimen for a patient?

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When a blood sample is collected, the main goal is to have enough quality specimen to run all the requested tests accurately. A second draw is commonly needed when the first specimen can’t be used for all reasons—either there isn’t enough blood to meet the required volumes, or the sample isn’t suitable for testing. Poor sample quality such as hemolysis (red blood cells broken during collection or handling), clotting in a serum tube, lipemia, or improper labeling that raises misidentification concerns can render the specimen unusable. In those cases, a redraw ensures the lab has a valid, adequate sample to complete all ordered tests correctly. It’s not typically driven by a patient’s request for more blood, nor by a desire to avoid processing delays, and it isn’t about simply “emptying” the vein.