Anyway, the typical CEA range is < 3.0 ng/mL (that is < 30mg/DL). Some folks are naturally higher. Others are in that range. Sometimes certain cancers will elevate a patients CEA levels, othertimes or with other cancers, CEA will be normal. Sometimes other things elevate CEA. Typically, from what I've read, heard, and studied, most doctors would say CEA < 10ng/mL (< 100ug/DL) could be normal or caused by things like smoking, not really a cause for alarm, but screening might be in order to determine the cause.
Operating System. An operating system or OS is a software program that enables the computer hardware to communicate and operate with the computer software. Without a computer operating system, a computer and software programs would be useless. The picture is an example of Microsoft Windows XP, a popular operating system and what the box may look like if you were to visit a local retail store to purchase it.
OS is an abbreviation for the word Operating System. An Operating System is the software that tells a computer how to operate. It controls hardware, executes programs, manages tasks and resources, and provides the user with an interface to the computer.ou can also find out if your computer is running a 32-bit or 64-bit version of Windows in the same areas listed above. Macintosh. OS X (Mac OS X) - Click the Apple menu at the top of your screen then click About this Mac. To get more detailed information after that click More Info Software.