How can I verify data in fields on a web page that were entered using a data loop and from Excel

For example, you have a data driven test that reads the contents of an Excel file,

which populates the appropriate fields to you web app, in no particular order

To ensure that the data is populated correctly, you will have to read each item (row) from your web app, and then look up this value to see if it exists in your spreadsheet. Using some sort of unique key.

You might be able to do this during data driven testing, or after, once all data has been populated.