How long should a tourniquet typically be left on before blood collection?

A tourniquet should typically be left on for no longer than 1 minute before blood collection because prolonged application can lead to hemoconcentration. Hemoconcentration occurs when blood components such as cells and proteins become concentrated due to the restriction of blood flow, which can affect test results. By adhering to the 1-minute guideline, phlebotomists help ensure that the sample collected reflects the patient's true physiological state.

The correct timing also aligns with best practices to minimize discomfort for the patient and reduces the risk of complications, such as the formation of hematomas or other adverse effects from sustained pressure on the blood vessels. Maintaining this time limit helps ensure the integrity of the sample while promoting patient safety and comfort.