Fetal Gestational Age Calculator

Tool Introduction

The Fetal Gestational Age Calculator is an online tool designed to help expectant parents and healthcare professionals accurately estimate fetal gestational age based on ultrasound measurement data. This tool supports calculations for various ultrasound biometric indicators, including Crown-Rump Length (CRL) for the first trimester, and Biparietal Diameter (BPD), Head Circumference (HC), Abdominal Circumference (AC), Femur Length (FL), Transcerebellar Diameter (TCD), and Foot Length (FoL) for the second and third trimesters. You can choose a single indicator for a quick calculation or use a combination of multiple indicators (such as HC+FL or BPD+HC+AC+FL) for a more comprehensive gestational age assessment to obtain more accurate results. It helps you better understand fetal development and provides a reference for estimating the due date.

How to Use

1. Select Calculation Method: Based on the ultrasound measurement data you have, choose the most suitable calculation method from the different tabs at the top of the page, such as "First Trimester (CRL)", "Biparietal Diameter (BPD)", or "BPD+HC+AC+FL", etc.
2. Enter Measurement Data: In the selected tab, fill in the fetal ultrasound measurement values in the corresponding input fields as prompted. Please ensure the input data unit is millimeters (mm). All input fields marked with "*" are required.
3. Click Calculate: After entering the data, the system will automatically perform the calculation (or you may need to click a "Calculate" button, depending on the front-end implementation).
4. View Results: The calculation result will be displayed in the result area as "Gestational Age (Weeks)".

Input Parameter Requirements: All input parameters are numerical, in millimeters (mm), and are required. For example, Crown-Rump Length (CRL) defaults to 50, and Head Circumference (HC) defaults to 200.

Output Result Format: The tool will directly display the calculated "Gestational Age (Weeks)", for example, "11.5 weeks".

Frequently Asked Questions

• Q: What gestational age calculation methods does this calculator support?
• A: This tool supports calculations for various ultrasound biometric indicators, including Crown-Rump Length (CRL) for the first trimester, and single or combined calculations (such as HC+FL, BPD+HC+AC+FL) for Biparietal Diameter (BPD), Head Circumference (HC), Abdominal Circumference (AC), Femur Length (FL), Transcerebellar Diameter (TCD), and Foot Length (FoL) in the second and third trimesters.
• Q: What are the requirements for input data?
• A: All input data must be fetal ultrasound measurement values, in millimeters (mm), and must be positive integers or decimals. Please ensure the accuracy of the input data.
• Q: What is the unit of the calculated gestational age?
• A: The unit of the calculated gestational age is "weeks".
• Q: Are the calculation results of this tool accurate?
• A: This tool uses clinically common gestational age calculation formulas. However, ultrasound measurement data can be affected by various factors, such as fetal position, measurement errors, and individual differences. Therefore, the calculation results are for reference only, and the specific gestational age should be determined by a professional doctor in conjunction with clinical conditions.

Notes

• Data Source: Please ensure that the input data comes from ultrasound examination reports issued by professional medical institutions to ensure the accuracy of the calculation.
• Choose the Appropriate Calculation Method: In the first trimester (usually before 14 weeks of gestation), Crown-Rump Length (CRL) is the most accurate indicator for assessing gestational age. As gestational weeks increase, other indicators such as BPD, HC, and FL should be used for assessment, and multi-indicator combined calculations usually provide a more comprehensive gestational age reference.
• Reference Nature of Results: The gestational age calculation results provided by this tool are for reference and learning purposes only and cannot replace professional medical diagnosis and doctor's advice. If you have any questions, please consult a professional doctor in time.
• Data Unit: All input data must be in millimeters (mm). If your ultrasound report provides data in centimeters (cm), please convert it to millimeters before inputting (e.g., 1 cm = 10 mm).