Why is it important to allow a free flow of blood during capillary blood collection?
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The Importance of Time and Blood Flow
The highest accuracy is generally reached from the fourth drop after puncture, with good capillary flow occurring for a period of 30 to 45 seconds. After this time coagulation will occur, and if the blood is sampled then, blood clotting can lead to inaccurate hemoglobin results.
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