A patient has a hematocrit of 65%. Which of the following is true related to coagulation testing?
a. Hematocrit does not affect coagulation testing.
b. Tube must be recollected with heparin as the anticoagulant.
c. Tube must be recollected using 0.34 mL of sodium citrate to 4.5 mL of blood.
d. Tube must be recollected using 0.62 mL of sodium citrate to 4.5 mL of blood.
ANS: C
The plasma volume is relatively low in a patient who has a high hematocrit. This unacceptably raises the anticoagulant-to-plasma ratio, invalidating test results that become falsely prolonged. When the hematocrit is greater than 55%, the volume of citrate must be decreased to optimize the anticoagulant-to-plasma ratio. Blood is not collected in heparin for coagulation tests.
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