Question

making a fist with a tourniquet on during a venipuncture can alter levels of ____________?
a) c - peptide
b) magnesium
c) sodium
d) potassium

Explanation:

During venipuncture, making a fist with a tourniquet can cause hemolysis (red blood cell breakdown). Potassium is mainly intracellular. When red blood cells break down (hemolysis), potassium is released into the plasma, altering its level. C - peptide, magnesium, and sodium are less affected by this specific action (hemolysis from fist - making with tourniquet in the context of venipuncture).

Answer:

d) Potassium