1. What Is Wheel Ultrasound Calc?

The Wheel Ultrasound Calculator estimates gestational age using ultrasound measurements. It provides accurate pregnancy dating based on fetal biometric parameters measured during ultrasound examination.

2. How Does The Calculator Work?

The calculator uses standard fetal biometric formulas:

Where:

• \( BPD \) — Biparietal Diameter (mm)
• \( HC \) — Head Circumference (mm)
• \( AC \) — Abdominal Circumference (mm)
• \( FL \) — Femur Length (mm)

Explanation: Different fetal measurements provide the most accurate dating at different gestational periods, with composite measurements offering the best overall accuracy.

3. Importance Of Ultrasound Dating

Details: Accurate gestational age determination is crucial for proper prenatal care, timing of deliveries, and identifying fetal growth abnormalities.

4. Using The Calculator

Tips: Enter ultrasound measurements in millimeters, select the appropriate measurement type, and ensure all values are within clinically reasonable ranges.

5. Frequently Asked Questions (FAQ)

Q1: Which Measurement Is Most Accurate For Dating?
A: Crown-rump length in first trimester, composite measurements in second trimester, and head circumference in third trimester.

Q2: How Accurate Is Ultrasound Dating?
A: ±5-7 days in first trimester, ±10-14 days in second trimester, ±21-30 days in third trimester.

Q3: When Should Ultrasound Dating Be Used?
A: When LMP is uncertain, cycles are irregular, or there's discrepancy between LMP and clinical findings.

Q4: What Are The Limitations?
A: Accuracy decreases with advancing gestation, and fetal anomalies or growth restriction can affect measurements.

Q5: Can This Replace Clinical Assessment?
A: No, this calculator is for educational purposes and should not replace professional medical evaluation.