Related Experiment Video

Updated: Aug 23, 2026

Cardiac Loading using Passive Left Atrial Pressurization and Passive Afterload for Graft Assessment
08:49

Cardiac Loading using Passive Left Atrial Pressurization and Passive Afterload for Graft Assessment

Published on: August 2, 2024

Optimum blood collection intervals for B-type natriuretic peptide testing in patients with heart failure

Alan H B Wu1, Andrew Smith, Fred S Apple

  • 1Department of Pathology and Laboratory Medicine, Hartford Hospital, Hartford, Connecticut 06102, USA. awu@harthosp.org

The American Journal of Cardiology
|June 15, 2004
PubMed

Insights

Serial B-type natriuretic peptide (BNP) measurements in heart failure patients show significant changes most often when collected 7 days apart. Daily collections yield fewer statistically different BNP results.

Area of Science:

  • Cardiology
  • Biomarker Analysis
  • Clinical Chemistry

Background:

  • Elevated B-type natriuretic peptide (BNP) levels are indicative of congestive heart failure.
  • Understanding the variability of BNP measurements is crucial for effective patient monitoring.

Purpose of the Study:

  • To determine the frequency of statistically significant changes in serial BNP measurements.
  • To analyze how the time interval between blood collections impacts BNP measurement variability.

Main Methods:

  • Analysis of serial B-type natriuretic peptide (BNP) measurements in patients.
  • Calculation of the frequency of BNP results exceeding 100% biologic variation.
  • Comparison of measurement variability based on different days between blood collections.

Main Results:

  • Samples collected 7 days apart showed the highest frequency (50%) of statistically significant BNP changes (increase or decrease).
  • Daily blood collections resulted in a lower frequency (22%) of statistically significant BNP changes.
  • Biologic variation of BNP was a key factor in assessing result significance.

Conclusions:

  • The optimal timing for serial BNP measurements in heart failure patients may be around 7 days to capture meaningful changes.
  • Shorter intervals like daily collections may not reflect true biologic changes due to inherent BNP variability.
  • BNP serial measurement frequency impacts the interpretation of patient status in congestive heart failure.

More Related Videos

Pre-clinical Model of Cardiac Donation after Circulatory Death06:26

Pre-clinical Model of Cardiac Donation after Circulatory Death

Published on: August 2, 2019

Related Concept Videos

Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers01:19

Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers

Cardiac biomarkers are critical in diagnosing, prognosing, and managing cardiovascular diseases. Routine measurement of specific biomarkers such as B-type natriuretic peptide (BNP), C-reactive protein (CRP), and homocysteine (Hcy) is common practice in clinical settings to evaluate heart function and predict cardiovascular events.
These markers indicate stress or strain on the heart muscle:
Natriuretic Peptides (BNP)
Cardiac myocytes produce these hormones in response to ventricular stretching...
Heart Failure II: Pathophysiology01:29

Heart Failure II: Pathophysiology

Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
Blood Studies for Cardiovascular System I: Cardiac Biomarkers01:20

Blood Studies for Cardiovascular System I: Cardiac Biomarkers

Cardiac biomarkers are enzymes, proteins, and hormones released into the blood when cardiac cells are injured. They are powerful tools for triaging.
The essential diagnostic tools for detecting myocardial necrosis and monitoring individuals suspected of having acute coronary syndrome (ACS) include:
Troponins
Troponins, particularly cardiac troponins I and T, are the most precise and sensitive markers of myocardial injury. They are detectable within 4-6 hours of myocardial injury and remain...
Determination of Multiple Dosing Parameters: Steady-State, Minimum and Maximum Concentrations01:15

Determination of Multiple Dosing Parameters: Steady-State, Minimum and Maximum Concentrations

Gentamicin, an aminoglycoside antibiotic, is commonly administered via intermittent intravenous infusion to treat severe infections. An intermittent one-hour infusion of gentamicin, administered at eight-hour intervals, allows for precise control of plasma drug concentrations, minimizing toxicity while ensuring therapeutic efficacy. Pharmacokinetic principles govern the dynamics of plasma concentrations and can be mathematically described using specific equations.The plasma drug concentration...