34  PACS Lag Diagnostics

34.1 Why this matters

Even after scanning, upload delays can stall pathologist access. Measuring scan→PACS lag highlights network or PACS ingestion issues.

34.2 Lag Distribution

34.3 Lag by Scanner

34.4 Interpretation Guide

• A heavy tail in the lag histogram suggests network congestion or PACS throttling; coordinate with IT during peak times.
• If one scanner shows consistently higher lag, inspect its transfer path or local network segment.
• Track lag medians weekly; sudden increases often precede PACS/storage issues.