It helps secure and manage electronic health records, making data tamper-proof while still allowing authorized providers to share information easily. It’s also valuable for clinical trials and drug supply chains, where transparency, traceability, and data integrity are critical for patient safety and regulatory compliance.

That usually happens because the form loads before the query has any data to return, so the DLookup evaluates to an error. You can avoid showing error by wrapping the DLookup in Nz() or an IIf() check, for example returning an empty string or 0 when nothing is found. Another option is to refresh or requery the form (or control) in the form’s On Load or On Current event so the query runs before the textbox is evaluated.