Understanding HL7 v2 PV1-44: Admit Date/Time in Practice
PV1-44 looks like a plain timestamp, but the precision it arrives with varies by source system — some send down to the second, others truncate to the minute or even the day — and length-of-stay calculations built on an assumed precision quietly drift as a result.
PV1-44 is the forty-fourth field of the PV1 segment — a timestamp recording the date and time the patient was formally admitted to this visit.
What this field contains
Example
The 44th field (202607261430) records an admit date/time of July 26, 2026 at 2:30 PM. Synthetic patient — not a real person.
Where this trips people up
Length-of-stay and throughput calculations built against a single source system that always sends minute-level precision will silently misbehave the moment a second source feeds in date-only values, since a parser that assumes a fixed-length timestamp string either throws on the shorter format or defaults the missing hour and minute to midnight — turning a real admission time into a fabricated one that skews every downstream metric.