LOINC Code 21978-2: Source of follow-up information Cancer

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 Source of follow-up information. It is commonly used with the system or sample type Cancer.XXX.

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

What it does not mean

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

Key facts

• Source of follow-up information Cancer
• Source of follow-up information
• Records the source from which the latest follow-up information was obtained. For registries performing follow-up, this field helps evaluate the success rates of various methods of follow-up. It also can be used to report to institutions the source of follow-up information that is sent to them. When there is a conflict in follow-up information, knowing the source can help resolve the inconsistency... NAACCR Data Standards and Data Dictionary Version 11
• CA; Misc; Miscellaneous; Nominal; Oncology; Other; Point in time; Random; Source follow-up info; Spec; Srce; To be specified in another part of the message; TUMOR REGISTRY(NAACCR); Typ; Unspecified

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