Fetal Weight Gestational Age Reference Table

Tool Introduction

The "Fetal Weight Gestational Age Reference Table" is a data tool based on the NICHD (National Institute of Child Health and Human Development) Asian singleton fetal estimated fetal weight (EFW) normal reference values. This tool clearly displays the "low (3rd percentile)", "standard (50th percentile)", and "high (97th percentile)" ranges for fetal weight from 10 to 42 weeks of gestation, in grams (g). It aims to help expectant parents and healthcare professionals quickly look up and assess whether fetal growth and development are within the normal range, providing an important reference for fetal health monitoring during pregnancy.

How to Use

1. Determine Gestational Age: First, you need to know the pregnant woman's precise gestational age (in weeks).
2. Find the Table Row: In the tool's table, find the row corresponding to your gestational age in the "Gestational Age (Weeks)" column on the left.
3. Consult Reference Values: In that row, you can view the "low (3rd)", "standard (50th)", and "high (97th)" reference values for fetal weight at that gestational age. These values represent the distribution range of fetal weight for Asian singleton fetuses at that gestational age.

Input Parameter Format: Users do not need to enter data; they only need to look up the gestational age in the table.
Output Result Format: Presented in a table format, including gestational age (weeks), low weight (g), standard weight (g), and high weight (g).

Usage Example

Suppose an Asian singleton pregnant woman is currently at 28 weeks of gestation and wants to inquire about the fetal weight reference range.

• Operation Demonstration: The user opens this tool and directly finds the row with "Gestational Age (Weeks)" as "28" in the table.
• Expected Output Result:

• Result Interpretation: According to the table, for an Asian singleton fetus at 28 weeks of gestation, the normal range for estimated fetal weight (EFW) is 910 grams to 1408 grams, with a median of 1132 grams. If the pregnant woman's fetal EFW is around 1132 grams, it falls within the standard range.

Frequently Asked Questions

• Q: What is the data source and target population for this reference table? A: The data for this tool is based on the normal reference values for estimated fetal weight of Asian singleton fetuses from NICHD (National Institute of Child Health and Human Development). Therefore, it is primarily applicable to pregnant women with singleton pregnancies of Asian ethnicity.
• Q: How should I understand the "3rd", "50th", and "97th" percentiles in the table? A: The "3rd" percentile means that 97% of fetal weights at that gestational age are above this value, and it is usually considered a lower critical value; the "50th" percentile is the median, meaning 50% of fetal weights are above or below this value, representing the average level; the "97th" percentile means that only 3% of fetal weights at that gestational age are above this value, and it is usually considered a higher critical value. These percentiles help assess the relative position of fetal weight within the population.
• Q: What if my baby's weight is not within the "standard (50th)" range? A: This tool provides reference values for a preliminary understanding of fetal development trends. If your baby's weight is leaning towards the "low" or "high" range, or if you have any concerns, please consult your obstetrician. The doctor will conduct a professional assessment based on your specific situation, other ultrasound data, and clinical manifestations, and provide personalized advice or further examinations. Please do not self-diagnose or take action.
• Q: What is the formula for calculating estimated fetal weight (EFW)? A: Estimated fetal weight (EFW) is usually calculated by measuring multiple biological indicators of the fetus (such as biparietal diameter BPD, head circumference HC, abdominal circumference AC, femur length FL) via ultrasound, and then plugging them into specific mathematical formulas. This tool does not provide EFW calculation functionality but rather provides reference ranges based on these calculated results.

Important Notes

• Data Applicability: Please note that the data in this reference table specifically refers to Asian ethnicity and singleton pregnancies. If you are of non-Asian ethnicity or have a multiple pregnancy, the reference value of this table may be limited. Please be sure to consult your doctor to obtain standards more suitable for your situation.
• Unit Clarity: All weight data in the table are in grams (g).
• For Reference Only: The weight values provided by this tool are statistical reference ranges and cannot replace professional medical diagnosis. Actual fetal development is influenced by various factors, and individual differences exist.
• Consult a Doctor: When interpreting fetal weight reports, be sure to combine them with your doctor's professional advice. If you have any concerns about fetal weight being too large, too small, or growth retardation, you should promptly communicate with your obstetrician to obtain an accurate assessment and guidance.