LOINCActiveObservation

LOINC Code 33878-0: Mean blood flow rate by US

33878-0 is a LOINC code used to identify Mean blood flow rate by US in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Blood flow rate.mean. It is commonly used with the system or sample type {Circulatory system}.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

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 rate.mean. It is commonly used with the system or sample type {Circulatory system}.

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: US

What it does not mean

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

Key facts

  • Mean blood flow rate by US
  • Blood flow rate.mean
  • Time averaged volume blood flow typically computed from the time averaged mean velocity and the lumen area. Units are volume per unit time, e.g. ml/min.
  • Average; Avg; Bld flow; Bld flow rate; Circ; Circ sys; Dynamic; Echography; Flow; GENERAL ULTRASOUND; Point in time; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; ULS; Ultrasound; Vmean; Volume Rate; vRate

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

Mean blood flow rate by USVmean USBlood flow rate.meanGEN.USVRatPt{Circulatory system}

Frequently asked questions

Code details

Code33878-0
SystemLOINC
Display nameMean blood flow rate by US
DescriptionBlood flow rate.mean
Short nameVmean US
ComponentBlood flow rate.mean
PropertyVRat
TimingPt
System (specimen){Circulatory system}
ScaleQn
MethodUS
ClassGEN.US
Example unitsmL/s
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.09
Last changed2.67

Part names

Blood flow rate.meanVRatPt{Circulatory system}QnUSVolume RatePoint in time (spot)Ultrasound

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.

LOINC Code 33878-0 | HealthAssure