LOINC Code 18549-6: ST amplitude.J point+20 ms Lead III

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 ST amplitude.J point+20 ms. It is commonly used with the system or sample type Lead III.

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
• Method: EKG

What it does not mean

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

Key facts

• ST amplitude.J point+20 ms Lead III
• ST amplitude.J point+20 ms
• Added to accommodate measures defined in CEN/TC251/PT007, SCP-ECG (Standard Communications Protocol for Computerized Electrocardiography)
• 3; Cardio; Cardiology; ECG; EKG.MEASUREMENTS; Electrical potential; Electrocardiogram; Electrocardiograph; Heart Disease; J Pnt ST Amp+20ms; L-III; Point in time; QNT; Quan; Quant; Quantitative; Random; Voltage

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