Pregnancy Sonography Calculator
Calculate gestational age, estimated fetal weight, and growth percentiles from ultrasound biometric measurements with comprehensive fetal assessment tools.
Sonographic Assessment Results
Gestational Age Assessment:
| Parameter | Measurement | GA Estimate | Percentile |
|---|---|---|---|
| BPD | 70.5 mm | 28w 2d | 52nd |
| HC | 265.8 mm | 28w 4d | 48th |
| AC | 235.2 mm | 28w 3d | 55th |
| FL | 52.8 mm | 28w 1d | 45th |
Composite Assessment:
Growth Percentile Chart:
Fetal measurements are within normal range (10th-90th percentile)
Clinical Recommendations:
Normal Growth Pattern
Fetal biometry consistent with gestational age. Continue routine prenatal care.
Next Assessment
Recommended follow-up scan in 4-6 weeks to monitor continued growth.
About
Our Pregnancy Sonography Calculator provides comprehensive fetal biometric analysis, gestational age estimation, and growth assessment tools for healthcare professionals and educational purposes.
Why Choose
Advanced biometric formulas, multiple weight estimation methods, Doppler studies integration, growth percentile charts, and comprehensive clinical assessment tools in one platform.
Features
Multiple biometric parameters, estimated fetal weight calculations, Doppler indices, growth percentiles, measurement consistency analysis, and clinical recommendations.
Benefits
Accurate gestational age dating, fetal growth monitoring, early detection of growth abnormalities, standardized assessment protocols, and educational value for medical training.
Enter Measurements
Input biometric measurements from ultrasound scan including BPD, HC, AC, FL, and additional parameters as available from your examination.
Select Parameters
Choose weight estimation formula, add Doppler studies if available, and enter relevant dates for comprehensive growth assessment.
Analyze Results
Review gestational age estimates, fetal weight, growth percentiles, measurement consistency, and clinical recommendations for patient care.
Frequently Asked Questions - Pregnancy Sonography Calculator
For first trimester: Crown-Rump Length (CRL) is most accurate until 14 weeks. For second/third trimester: BPD, HC, AC, and FL are the standard measurements. Early pregnancy dating (before 20 weeks) is most reliable. Combining multiple parameters improves accuracy and helps identify growth abnormalities.
EFW calculations have a margin of error of ±15-20% (1 standard deviation). The Hadlock formula is most widely used and validated. Accuracy decreases with extremes of fetal size and in third trimester. Multiple formula comparison and serial measurements improve reliability for growth monitoring.
Growth percentiles compare fetal measurements to reference population: 50th percentile = average size, 10th-90th percentile = normal range, <10th percentile = small for gestational age (SGA), >90th percentile = large for gestational age (LGA). Consistent percentiles across parameters suggest normal proportional growth.
Doppler studies assess blood flow in fetal vessels. Umbilical artery Doppler evaluates placental function, MCA Doppler assesses fetal response to hypoxia. CPR (cerebroplacental ratio) combines both. Indicated for growth restriction, hypertension, diabetes, or other high-risk conditions requiring fetal surveillance.
Discrepancies >2 weeks between parameters may indicate: measurement errors, fetal abnormalities, growth restriction, or macrosomia. AC discordance often appears first in growth problems. Consistent measurements across parameters suggest normal growth. Serial scans help differentiate constitutional variation from pathological growth.