Commentary

[摘要] Pleural fluid and other biological fluids appear white because of light scattering by cells, crystals, colloidal particles, macromolecules, or lipoproteins. Larger particles are more effective at scattering light than smaller ones, and measurement of light scatter can even be used to calculate particle diameter. Only chylomicrons and VLDL cholesterol are large enough to appear white or turbid to the human eye, whereas LDL and HDL cholesterol are clear, even in extreme conditions such as familial hypercholesterolemia, in which plasma is transparent despite LDL …

[学科分类] 过敏症与临床免疫学