LOINC Code 2904-1: Pyrophosphate crystals (Syn fld) [#/Vol]

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 Pyrophosphate crystals. It is commonly used with the system or sample type Synv 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: Observation

What it does not mean

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

Key facts

• Pyrophosphate crystals [#/volume] in Synovial fluid
• Pyrophosphate crystals
• #; ABS; absolute; absolutes; Cnt; Count; Count/volume; Crys; Cryst; Crystal; CT; HEMATOLOGY/CELL COUNTS; Joint aspirate; Joint fld; Joint flu; Joint fluid; Number concentration; Number Concentration (count/vol); Point in time; Pyrophos Cry; QNT; Quan; Quant; Quantitative; Random; SF; SNV; Syn; Syn fl; Synov; Synovial fluid

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