Which of the following is true of the APTT?
A. The mean reference value is about 35 seconds.
B. Blood is collected in a 3.8% sodium citrate solution.
C. The ratio of anticoagulant to blood is 1:5.
D. Serum for testing is obtained by centrifuging whole blood.
Answer: A
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The major chemical constituents of enamel are calcium, phosphorus, magnesium, and carbonate
Indicate whether the statement is true or false
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