English to Italian Medical Medical: Instruments Prelievi di sangue

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Come si traduce l'espressione in oggetto in italiano?
Si parla della raccolta di sangue capillare nei neonati. La frase è questa:
"Where blood spots are sampled using coring devices, to minimize cross contamination, the coring device should be “cleaned” between sample discs by cutting two sample punches from blank filter paper or an unspotted area of the 903® Card and discarding the blank discs to waste."

Grazie mille
Antonio