LOINC Code 51900-9: Population Summary note

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Population summary report. It is commonly used with the system or sample type {Setting}.

When is it used?

• Used in lab systems, EHRs, and clinical data exchange.
• May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
• Status: ACTIVE
• Order vs observation: Both
• Method: {Role}

What it does not mean

• The code identifies the observation or test, not the actual result.

Key facts

• Population Summary note
• Population summary report
• This is a general summary for population level data. Originally created (but not limited in use) for HAI reporting. An example is the ICU Denominator report containing four Summary Data Observations representing patient days, central line days, urinary catheter days, and ventilator days. Summary data reporting on a population (e.g. all patients in an ICU).
• DOC.ONT; Document; Finding; Findings; Point in time; Pop summary report; Random

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Frequently asked questions