LOINC Code 18164-4: Deprecated Left ventricular outflow tract Peak systolic flow velocity by US.doppler

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 Blood flow.systole.max. It is commonly used with the system or sample type Heart.ventricle.left.outflow tract.

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: DEPRECATED
• Order vs observation: Observation
• Method: US.doppler

What it does not mean

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

Key facts

• Deprecated Left ventricular outflow tract Peak systolic flow velocity by US.doppler
• Blood flow.systole.max
• Bld flow; Bld flow.sys; CARD.US; Cardiac; Cardio; Cardiology; DOP; DUPLEX; Dynamic; Echography; Heart Disease; Hrt; Hrt ventr; L; Largest; LT; LV; LVOT; Max V; Maximal; Maximum; Peak; Peak S; Point in time; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; Sys; Sys.max; Syst; ULS; Ultrasound; V max; VEL max; Velocity; Ventricular; Vmax; Vmax sys

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