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Left Ventricular Ejection Fraction (LVEF) with 3-Day Segment Analysis

Published: August 9, 2026Updated: August 16, 2026

This test measures how effectively your heart pumps blood out of the left ventricle over a 3-day period, broken down into segments for detailed assessment of heart function.

Quick summary

["Helps evaluate long-term heart performance and identify trends in blood flow efficiency."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
79990-8
Short code
LV EF 3D segmentation
Synonyms
LV EF 3D segmentation
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
us-d-segmentation
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What This Test Measures

LVEF is calculated by comparing the volume of blood pumped out of your heart with each heartbeat to the total volume of blood in the left ventricle at the end of a filling cycle. The 3-day segmentation provides a snapshot of how consistently your heart maintains this function over time, divided into specific time intervals for closer monitoring of potential declines or improvements.

Why It’s Done

Your healthcare provider may order this test if you have symptoms like fatigue, shortness of breath, or swelling that suggest heart dysfunction. It’s also used to monitor heart conditions like heart failure, after a heart attack, or during treatment for heart disease to track changes in heart performance over time.

Common Uses and Indications

This test is particularly useful for patients with known or suspected heart conditions, those undergoing cardiac rehabilitation, or those taking medications that affect heart function. It helps determine the effectiveness of treatments and adjusts care plans accordingly.

How the Test Works

The test involves analyzing blood samples (likely from whole blood or plasma) to assess cardiac function indirectly. Advanced imaging techniques, such as echocardiography, are used to measure blood flow and ventricular function. The segmentation analysis breaks down these measurements into three-day intervals to provide a detailed trend over time.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

LVEF Segmentation Over Time

Frequently asked questions

How does this test differ from a standard LVEF measurement?
Unlike a single-point LVEF measurement, this test provides a longitudinal view of heart function over three days. It helps detect subtle but significant changes in heart performance that might not be apparent in a single test, aiding in early intervention and personalized treatment plans.
What does a low or high LVEF segmentation mean?
A consistently low LVEF across segments may indicate worsening heart failure or reduced cardiac efficiency, prompting closer monitoring or adjustments to treatment. A high LVEF may suggest normal or improved heart function, but further evaluation is needed if symptoms persist. Your provider will interpret results in the context of your overall health and symptoms.
Can this test be used to diagnose heart failure?
While LVEF segmentation is a key tool in assessing heart function, it is not definitive for diagnosing heart failure. Combined with clinical symptoms, physical exams, and other diagnostic tests, this test helps guide decisions about diagnosis, treatment, and management of heart-related conditions.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy