LOINC Code 18507-4: QRS axis.horizontal plane Reference beat

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 QRS axis.horizontal plane. It is commonly used with the system or sample type Reference beat.

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

• QRS axis.horizontal plane Reference beat
• QRS axis.horizontal plane
• Added to accommodate measures defined in CEN/TC251/PT007, SCP-ECG (Standard Communications Protocol for Computerized Electrocardiography)
• Cardio; Cardiology; ECG; EKG.MEASUREMENTS; Electrocardiogram; Electrocardiograph; Heart Disease; Point in time; QNT; QRS axis HP; Quan; Quant; Quantitative; Random; RefB

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