Unknown values are fine - leave a field blank and it's stored as a true null, not as text like "NA".
Pick the exact measurement - this drives the unit options below and how this record appears in Analytics figures.
One measured result for this sample. Stored in the normalized measurement table; the legacy result columns are mirrored automatically for backward compatibility.
Select a functionality category above to show the relevant units.
Choose a functionality category above to see the method fields for that assay.