Collection ProceduresCâu 22 / 100
A phlebotomist collects an aerobic and anaerobic blood culture set, then a green heparin tube, then a light blue citrate tube. What is the main problem?
a.The citrate tube was drawn after heparin, so heparin carryover can prolong clotting times
b.Heparin and citrate tubes cannot be drawn during the same venipuncture
c.Blood cultures should never be drawn first
d.There is no problem; the sequence is correct
Giải thích
The citrate tube must immediately follow the blood cultures and precede all serum and heparin tubes. Because heparin inhibits thrombin, carryover into the citrate tube can falsely prolong the aPTT. Blood cultures are correctly drawn first, and both tubes may be collected in one venipuncture as long as the sequence is respected.
Trích dẫn luật: CLSI GP41Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Why is the basilic vein the last antecubital choice for venipuncture?
- A light blue tube is filled only two thirds of the way because the vein collapsed. What should the phlebotomist do?
- How should an EDTA tube be mixed immediately after collection?
- A phlebotomist has just filled a light blue citrate tube. According to the standard order of draw, which tube is collected next?
- A patient is told to pump the fist repeatedly while the tourniquet is on. Which result is most affected?
- A coagulation specimen is the only tube ordered and a winged blood collection set will be used. What should be done first?
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