Lice Treatment: Examples of Over-the-Counter Products. Lice Treatment: Examples of Over-the-Counter Products. Lice Treatment: Examples of Over-the-Counter Products. There are quite a few over-the-counter products that claim to kill lice or their eggs (nits). Permethrin 1% creme rinse (such as Nix). Pyrethrins and piperonyl butoxide shampoo (such as RID).
In general, if someone has an increased serum osmolality, it is due to either decreased water in the blood or increased solutes. If the person has decreased serum osmolality, it is due to increased fluid levels.
This is what is used when values are measured by a laboratory. Osmolality is measured by clinical laboratories using an osmometer - either a freezing point depression osmometer or a vapour pressure depression osmometer. The normal osmolality of extracellular fluid is 280-295 mOsmol/kg.