Specimen HandlingQuestion 64 of 100
Which collection practice is most likely to hemolyze a specimen?
a.Forcing blood from a syringe through the needle into an evacuated tube
b.Inverting an EDTA tube gently eight times
c.Using a 21 gauge needle on a good antecubital vein
d.Letting the alcohol dry fully before puncture
Explanation
Pushing blood through a narrow needle under pressure shears red cells and is a classic cause of hemolysis, which is why a transfer device is used instead. Gentle inversion, an appropriately sized needle and fully dried alcohol all reduce hemolysis. Hemolysis falsely raises potassium, LDH, AST and magnesium and often forces a redraw.
Law Reference: CLSI GP41Practice all 100 questions free — no signup required.
Related questions on this topic
- A neonatal bilirubin is collected. How must the specimen be handled during transport?
- A cryofibrinogen test is ordered. What handling is required?
- Within what time should serum or plasma be separated from cells for routine chemistry testing?
- A chemistry specimen arrives visibly hemolyzed. Which result is most likely to be falsely elevated?
- A lavender tube submitted for a CBC contains visible small clots. What should happen?
- An unlabeled tube arrives in the laboratory with a completed requisition attached. What is the correct action?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against NHA Certified Phlebotomy Technician (CPT) Exam · How we review