Mucus moistens and cleans the nasal membranes, humidifies air, traps and clears inhaled foreign matter, and fights infection. Although it is normally swallowed unconsciously, the feeling of it accumulating in the throat or dripping from the back of your nose is called post-nasal drip.
RDW refers to the variation in size if your red blood cells. A â¦ low RDW means that the cells are all roughly the same size. A high RDW means there isa high variation in the sizes of the cells and usually means a deficiency of iron and/or B12.
A low RDW (below 10.2%) means that the red blood cells vary very little in size. One reason for a low RDW level is macrocytic anemia. Another cause of a low RDW level is microcytic anemia. In these two disorders the red blood cells do not vary much in size because they are either all small or all large. This is what causes the RDW level to be low