Skip to contentSkip to navigation
COVID-19: We are open. Some services are modified. Mask is mandatory. Details at


This test is used to help assess the proportion of bad cholesterol in a person’s blood.

The total cholesterol in the bloodstream is made up of different fractions, including LDL cholesterol (low-density lipoprotein, associated with the risk of developing cardiovascular disease) and HDL cholesterol (high-density lipoprotein, which offers protection). Bad cholesterol (LDL) can be assessed in different ways, for example, by determining the ratio between total cholesterol and good cholesterol (HDL) levels. The higher the proportion of bad cholesterol, the higher the ratio will be. This information is rarely used today, as current practice and treatment guidelines instead recommend specifically monitoring LDL and HDL cholesterol levels, or the fractions of non-HDL cholesterol or apolipoprotein B (see those headings).

Term of the Week

Hot zone

A hot zone is a section of a facility (sometimes an entire facility or even a city district) where there is a high risk of contamination by patients with an infectious disease. All individuals entering a hot zone must respect appropriate protective measures. By analogy, “cold zone” and “warm zone” are used to refer to areas where there is no infected individual or only individuals suspected of having an infection.