LOINC Code 18509-0: T wave 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 T wave 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

• T wave axis.horizontal plane Reference beat
• T wave 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; Quan; Quant; Quantitative; Random; RefB; T prime; T wave axis HP

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