Calcular Peso Feto Segun Femur
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Reviewed by Calculator Editorial Team
This calculator estimates fetal weight based on femur length using the Hadlock formula, which is commonly used in obstetric ultrasound measurements. The calculation helps medical professionals assess fetal growth and development during pregnancy.
How to Use This Calculator
To estimate fetal weight using the femur length:
- Enter the measured femur length in centimeters
- Select the appropriate gestational age range
- Click "Calculate" to get the estimated fetal weight
- Review the result and interpretation guidance
For most accurate results, use measurements taken between 18-22 weeks of gestation. The formula accounts for fetal growth patterns at different stages of pregnancy.
Formula and Methodology
The Hadlock formula estimates fetal weight based on femur length and gestational age:
The formula was developed based on statistical analysis of ultrasound measurements and fetal autopsy data. It provides a reasonable estimate of fetal weight when used within the appropriate gestational range.
Assumptions
- Measurements are taken between 18-22 weeks of gestation
- Femur length is measured in centimeters
- The formula is most accurate for singleton pregnancies
- Results may vary slightly between different ultrasound machines
Interpreting Results
The estimated fetal weight provides a general indication of fetal growth. Here's how to interpret the results:
| Estimated Weight | Interpretation |
|---|---|
| Below 2500 grams | May indicate potential growth restriction |
| 2500-4000 grams | Within normal range for gestational age |
| Above 4000 grams | May indicate macrosomia or potential complications |
Note that this is an estimate and actual birth weight may vary. Always consult with a healthcare professional for medical advice.
Limitations
While this calculator provides a useful estimate, there are several important limitations to consider:
- The formula is most accurate between 18-22 weeks of gestation
- Results may be less reliable for multiple pregnancies
- Fetal position and measurement technique can affect accuracy
- This is not a substitute for clinical assessment
Always verify results with a healthcare professional and consider additional ultrasound measurements for comprehensive fetal assessment.
Frequently Asked Questions
What is the most accurate gestational age for this measurement?
The formula is most accurate between 18-22 weeks of gestation. Measurements taken outside this range may produce less reliable results.
Can this formula be used for multiple pregnancies?
The formula is designed for singleton pregnancies. For multiple pregnancies, additional factors should be considered by a healthcare professional.
How accurate is this estimate compared to actual birth weight?
The formula provides a reasonable estimate with about ±15% accuracy. Actual birth weight may vary by several hundred grams.