A Patient Was Drawn for PT and PTT Testing

question 32

Multiple Choice

A patient was drawn for PT and PTT testing. The laboratory professional noticed that the packed cell volume appeared abnormally elevated. A CBC was also drawn with the coag and the hematocrit was 63%. A new Na Citrate tube was prepared to correct for the elevated hematocrit and a repeat coag sample was drawn. How much anticoagulant is needed for a 4.5ml draw?

• A) 1.9 ml
• B) 3.1 ml
• C) 3.4 ml
• D) 1.6 ml

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Definitions:

Forward Rate

The agreed-upon interest rate for a financial transaction that will take place in the future, mainly used in the context of currencies and bonds.

1-Year Bond

A bond that matures in one year, often used for short-term investment strategies.

Zero-Coupon Bond

A zero-coupon bond is a debt security that doesn't pay interest (a coupon) but is traded at a deep discount, rendering profit at maturity when the bond is redeemed for its full face value.

Purchase Price

The amount of money that has been agreed upon to buy an asset, product, or service.