additive

Medical term Phlebotomy

A substance in a blood tube, such as an anticoagulant or clot activator, that prepares the specimen for testing.

Sources

Free practice questions that use additive

Phlebotomy, question 3Which additive prevents clotting by inhibiting thrombin rather than by binding calcium?

anticoagulantA substance that prevents blood from clotting, such as heparin, EDTA or sodium citrate in tubes, or warfarin…
clot activatorA tube additive that speeds clotting so serum can be separated; it can interfere with coagulation tests.
basilic veinA superficial vein on the little-finger side of the arm; it lies near the brachial artery and a nerve, so it…
buffy coatThe thin pale layer of white cells and platelets between red cells and plasma in centrifuged blood.
butterfly needleA winged infusion set: a needle with plastic wings and tubing, used with a syringe or evacuated tubes.
capillary puncturePuncturing the skin of a fingertip or infant heel with a lancet to collect a small blood sample, often for…
centrifugeA machine that spins specimens at high speed to separate serum or plasma from blood cells.
cephalic veinA superficial vein on the thumb side of the arm, often used for venipuncture.
chain of custodyWritten documentation of everyone who handles a specimen, such as for a drug test, from collection to…
coagulationFormation of a blood clot.