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.
[arthro- + G. desis, a binding together]. /arÂ·throÂ·deÂ·sis/ (-deÂ´sis) the surgical fixation of a joint by a procedure designed to accomplish fusion of the joint surfaces by promoting the proliferation of bone cells; called also artificial ankylosis.oints are denuded of cartilage, then shaped to conform to each other at the optimal angle; bone grafting is often used, as is some form of fixation, either internal (screws, rods, plates) or external (e.g., with a cast or external fixator).