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High Osmolality Contrast Media (HOCM) refers specifically to a category of contrast agents that have a significantly higher osmotic pressure compared to blood. The correct characterization is that these agents possess an osmolality that is approximately 4-7 times greater than that of blood plasma. This high osmolality is important as it influences the distribution of contrast media in the body, especially in vascular imaging procedures.

HOCM is commonly associated with ionic contrast agents, which can lead to higher rates of adverse reactions due to their increased osmolality, making the understanding of their properties crucial for radiologists and technologists. The use of HOCM is often balanced with considerations of patient safety and the specific requirements of different imaging procedures.

In contrast, the description of low viscosity or the osmolality range of 600-850 mOsm/kg water does not accurately encapsulate the defining characteristics of HOCM. Additionally, stating that HOCM is used only for specific examinations is limiting and does not reflect the wider applications of these agents in a variety of imaging situations, including angiography and CT scans.