Recreation of an EDC-to-central-lab external data reconciliation, the DM activity of proving the site's eCRF entries agree with the lab vendor's direct electronic transfer before database lock. Data is synthetic but modeled on the CDISC SDTM LB domain (real LBTESTCD, LBCAT, LBSPEC, ISO-8601 LBDTC) and reconciles on USUBJID + VISIT + LBTESTCD with a configurable +/-2 day collection-date tolerance. Every figure is computed from the records, nothing is hard-coded.