In the order of draw for skin puncture, which item is drawn first?

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Multiple Choice

In the order of draw for skin puncture, which item is drawn first?

In capillary (skin puncture) draws, tests that are highly sensitive to contamination or dilution should be collected first to preserve specimen integrity. Blood gas analysis is one of the most affected by tissue fluid admixture and by delays or additives, so it must be drawn into its own heparinized container right away. Drawing other tubes or preparing slides first risks contamination from tissue fluid or from additives, which would skew pH, PCO2, and PO2 measurements. Once the gas sample is secured, you can proceed with the remaining specimens (EDTA for hematology, serum for chemistry, and slides) with less risk of affecting the gas results.

In capillary (skin puncture) draws, tests that are highly sensitive to contamination or dilution should be collected first to preserve specimen integrity. Blood gas analysis is one of the most affected by tissue fluid admixture and by delays or additives, so it must be drawn into its own heparinized container right away. Drawing other tubes or preparing slides first risks contamination from tissue fluid or from additives, which would skew pH, PCO2, and PO2 measurements. Once the gas sample is secured, you can proceed with the remaining specimens (EDTA for hematology, serum for chemistry, and slides) with less risk of affecting the gas results.

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