In this test, a tall, thin tube holds a sample of your blood. The speed at which the red blood cells fall to the bottom of the tube is measured. Inflammation can cause abnormal proteins to appear in your blood. These proteins cause your red blood cells to clump together.
From Wikipedia, the free encyclopedia. A user-defined function (UDF) is a function provided by the user of a program or environment, in a context where the usual assumption is that functions are built into the program or environment. 1 BASIC language.
A User Defined Function (or UDF) is a Function procedure that typically (but not necessarily) accepts some inputs and returns a result. A UDF can only return a value to the cell(s) whence it was called -- it must not modify the contents or formatting of any cell and must not modify the operating environment of Excel.