MS Excel: IsNA Function
In Excel, the IsNA function can be used to check for a #N/A (value not available) error.
The syntax for the IsNA function is:
IsNA( value )
value is the value that you want to test. If value is a #N/A error value , this function will return TRUE. Otherwise, it will return FALSE.
Applies To:
- Excel 2007, Excel 2003, Excel XP, Excel 2000
For example:
Let's take a look at an example:

Based on the Excel spreadsheet above:
=IsNA(A1) would return FALSE. =IsNA(A2) would return TRUE. =IsNA(A3) would return FALSE. =IsNA(A4) would return FALSE. =IsNA("Tech on the Net") would return FALSE. =IsNA(3/0) would return FALSE.