For most children, the National Heart, Lung, and Blood Institute recommends one cholesterol screening test between the ages of 9 and 11, and another cholesterol screening test between the ages of 17 and 21.
Wiktionary (0.00 / 0 votes) Rate this definition: fixation (Noun). The act of fixing, or the state of being fixed or fixated. fixation (Noun). The act of uniting chemically with a solid substance or in a solid form; reduction to a non-volatile condition; -- said of gaseous elements. fixation (Noun). The act or process of ceasing to be fluid and becoming firm.
internal fixation. 1  any method of holding together the fragments of a fractured bone without the use of appliances external to the skin. After open reduction of the fracture, smooth or threaded pins, Kirschner wires, screws, plates attached by screws, or medullary nails may be inserted through an appropriate incision to stabilize the fragments.