For citrate-specimen accuracy, what is the required maximum platelet count?

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Multiple Choice

For citrate-specimen accuracy, what is the required maximum platelet count?

For citrate-based coagulation testing, platelets in the plasma can influence clot formation by providing phospholipid surfaces and procoagulant activity. To obtain accurate clotting times, the plasma used must be platelet-poor, with a platelet count kept very low—typically less than 10 x 10^9/L. If the count is higher, platelet-driven acceleration of clotting can bias the results, making them appear faster than they truly are. Among the given options, <10 x10^9/L is the appropriate maximum. Counts higher than this (like 50 or 100 x10^9/L) would risk interference, and requiring <1 x10^9/L is more stringent than necessary for routine testing.

For citrate-based coagulation testing, platelets in the plasma can influence clot formation by providing phospholipid surfaces and procoagulant activity. To obtain accurate clotting times, the plasma used must be platelet-poor, with a platelet count kept very low—typically less than 10 x 10^9/L. If the count is higher, platelet-driven acceleration of clotting can bias the results, making them appear faster than they truly are. Among the given options, <10 x10^9/L is the appropriate maximum. Counts higher than this (like 50 or 100 x10^9/L) would risk interference, and requiring <1 x10^9/L is more stringent than necessary for routine testing.

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