This same logic is applied to insulating homes, buildings, and even spacecraft. In these cases, methods involve either trapped air pockets between walls, fiber-glass (which traps air within it) or high-density foam. Spacecraft are a special case, and use insulation in the form of foam, reinforced carbon composite material, and silica fiber tiles. All of these are poor conductors of heat, and therefore prevent heat from being lost in space and also prevent the extreme temperatures caused by atmospheric reentry from entering the crew cabin.
A lot of confusion has existed among providers who do nerve conduction studies and try to bill for them. Choosing the appropriate units, differentiating between motor and sensory nerves, with or without F-wave and H-reflex testing has generated a lot of questions over the years. For 2013, hopefully the confusion will diminish. CPT codes 95900, 95903, and 95904 will be deleted and new nerve conduction study codes will be created. No longer will you need to differentiate between motor and sensory, F-wave test, or H-reflex test. You only need to count the number of studies and choose the corresponding code.