Last values from measures in a table

Hi zenton ,

You can create a measure as below and put this new measure onto the card visual:

New Measure =
MAXX (
    GROUPBY (
        Labware,
        Labware[Date],
        Labware[LIMS Text ID],
        Labware[Analyte],
        Labware[Freq],
        Labware[Grade]
    ),
    [Limiting Contam Test]
)

If the above one can't help you get the desired result, please provide some sample data in your tables (exclude sensitive data) with Text format and your expected result with backend logic and special examples. It is better if you can share a simplified pbix file. You can refer the following link to upload the file to the community. Thank you.

How to upload PBI in Community

Best Regards