LOINC Code 81631-4: Methotrexate polyglutamates Nar (RBC) [Interp]

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 Methotrexate polyglutamates. It is commonly used with the system or sample type RBC.

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: Observation

What it does not mean

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

Key facts

• Methotrexate polyglutamates [Interpretation] in Red Blood Cells Narrative
• Methotrexate polyglutamates
• The overall interpretation of methotrexate polyglutamates (MTX-PGs) measurement results in red blood cells. Results are used to guide treatment planning and evaluation for various diseases, including rheumatoid arthritis.
• Amethoperin; Amethopterin; DRUG/TOXICOLOGY; Drugs; Erythrocytes; Impression; Impression/interpretation of study; Impressions; Interp; Interpretation; Methotrexat; Methotrexate polyglutamates; MTX; MTXpg; MTXpgs; MTX-PGs; Narrative; Point in time; RA; Random; Red blood cells; Red blood corpusles; Report; Rheumatoid arthritis

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