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.
An operating system or OS is a software on the hard drive 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 to the right is an example of Microsoft Windows XP, a popular operating system and what the box may look like if you were to purchase it from a local retail store. Operating System types. As computers have progressed and developed, so have the operating systems. Below is a basic list of the types of operating systems and a few examples of operating systems that fall into each of the types. Many computer operating systems will fall into more than one of the below types. GUI-Short for Graphical User Interface, a GUI operating system contains graphics and icons and is commonly navigated by using a computer mouse. See the GUI definition for a complete definition.