thrombus
Medical term Routine Blood Collections
A blood clot formed inside a vessel. A thrombosed vein feels hard or cordlike and is not used for venipuncture.
Related terms
- veinA vessel that carries blood back toward the heart under low pressure. Superficial arm veins are the usual…
- venipunctureEntering a vein with a needle to withdraw blood, usually at the antecubital area of the arm.
- syringeBarrel and plunger used with a needle or winged set, often for small or fragile veins; a 1 to 5 mL syringe…
- systemic circulationBlood flow from the left ventricle through the arteries to the body's tissues and back through the veins to…
- systolic pressureThe upper blood pressure number: the peak pressure in the arteries while the ventricles contract.
- thrombinClotting enzyme that turns fibrinogen into fibrin. Orange-top tubes use a thrombin-based clot activator to…
- tourniquetBand tied 7 to 10 cm (3 to 4 in, about 4 to 5 finger widths) above the site to slow venous return so veins…
- tube holderPlastic barrel that holds the tube and shields the hand. It stays attached to the used needle and is…
- vasovagal reactionReflex slowing of the heart and drop in blood pressure: pale, sweaty, nauseated or dizzy, sometimes…
- vein finderA transilluminator or similar device that lights up veins under the skin to help locate a hard-to-find vein.