LOINC Code 19163-5: Cancer Ag 19-9 Qn (Pleur fld)
19163-5 is a LOINC code used to identify Cancer Ag 19-9 Qn (Pleur fld) in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Cancer Ag 19-9. It is commonly used with the system or sample type Plr fld.
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 Cancer Ag 19-9. It is commonly used with the system or sample type Plr fld.
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
What it does not mean
- The code identifies the observation or test, not the actual result.
Key facts
- Cancer Ag 19-9 [Units/volume] in Pleural fluid
- Cancer Ag 19-9
- Arbitrary concentration; CA; CA 19-9; Cancer Ag19-9; Cancer antigen 19-9; Carbohydrate antigen; Carbohydrate antigen 19-9; Chemistry; Pleural; Pleural fluid; Point in time; QNT; Quan; Quant; Quantitative; Random; thoracentesis fluid; Tumor marker
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.
Related SNOMED CT concepts
Related observations and tests
Common synonyms
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.