Neonatal Echo Measurement Tool

1 What is the Neonatal Echo Measurement Tool?

The Neonatal 2D Echo tool is a point-of-care reference guide covering 23 individual echocardiographic measurements used in targeted neonatal echocardiography. Each measurement is organised by acoustic window — Subcostal, Apical, Parasternal, and Suprasternal — and can also be browsed by clinical function, such as fluid assessment, cardiac output, or pulmonary hypertension. For every measurement the guide documents the optimal view, step-by-step technique, normal values, and the peer-reviewed source it was drawn from, alongside a companion 'Echo Calculators' screen for computing the same formulas from live patient data.

2 When to use it

Assessing intravascular volume status at the bedside using IVC collapsibility or distensibility, depending on whether the infant is breathing spontaneously or mechanically ventilated.
Estimating cardiac output and left/right ventricular systolic function (EF, shortening fraction) in a haemodynamically unstable neonate.
Evaluating a suspected patent ductus arteriosus (PDA) — ductal flow pattern, LA/Ao ratio, and descending aortic Doppler for diastolic steal.
Screening for pulmonary hypertension using TR jet velocity, PAAT, eccentricity index, or septal deviation.
Confirming central line position (UVC tip) or assessing gut perfusion via coeliac/SMA Doppler.
Identifying structural findings such as anomalous pulmonary venous drainage from the suprasternal 'crab's view'.

3 Formula & method

The guide lists nine 'Key Formulae' quoted directly from the tool: EF (Simpson Biplane) = (EDV − ESV) / EDV × 100; Cardiac Output = VTI × π(d/2)² × HR ÷ weight (kg), in mL/kg/min; Simplified Bernoulli: pressure gradient = 4 × V² (mmHg); Shortening Fraction = (LVED − LVES) / LVED × 100; PAAT = time from start of RV ejection to peak pulmonary velocity (ms); LA/Ao = LA diameter ÷ Ao diameter (at LV systole); Eccentricity Index = D1 / D2 (D1 perpendicular to D2 through the interventricular septum); IVC Collapsibility = (Max − Min) / Max × 100; IVC Distensibility = (Max − Min) / Min × 100. Each individual measurement entry additionally documents how to obtain the view, the specific technique, standard landmarks, and normal-value ranges with severity flags (normal / abnormal / note).

ASE/CSE TNE Guidelines 2024
NICE CG98

4 Frequently asked questions

What acoustic windows does the Neonatal 2D Echo tool organise measurements by?

Four: Subcostal, Apical, Parasternal, and Suprasternal. The tool offers a 'By Window' browsing mode alongside a 'By Function' mode and a 'Quick Ref' mode.

What's the difference between IVC collapsibility and distensibility?

Collapsibility, (Max − Min)/Max × 100, is used in spontaneously breathing infants where over 50% is considered abnormal. Distensibility, (Max − Min)/Min × 100, is used instead in mechanically ventilated infants because the collapsibility index is less reliable in that setting.

Is there a formula for ejection fraction in the tool?

Yes — EF (Simpson Biplane) is listed as (EDV − ESV) / EDV × 100 in the tool's Key Formulae reference.

Can I calculate these echo values instead of just reading normal ranges?

Yes — an 'Echo Calculators' screen linked from the guide lets you compute the same formulas from live patient measurements.

What guidelines back these neonatal echo measurements?

Individual measurements cite the guide's listed sources, including ASE/CSE TNE Guidelines 2024 and NICE CG98, plus measurement-specific peer-reviewed literature such as Kluckow & Evans, El-Khuffash, and Jain & McNamara.

5 Related tools

For qualified clinicians. This page and the PediAid app are a clinical aid only. Calculations and reference data must be verified against the patient's clinical context, the source guideline and your local protocols before any treatment decision is made.