Fetal Weight Gestational Age Reference Table

NICHD Asian singleton fetal gestational age weight reference table, helping you quickly assess fetal development.

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NICHD Asian Race Singleton EFW Normal Reference Value Table (Unit: g)

Data based on NICHD Asian Race Singleton Fetal Estimated Weight Reference Values

Gestational Age (Weeks)	Low (3rd)	Standard (50th)	High (97th)
10	27	34	43
11	34	43	54
12	43	54	68
13	55	68	86
14	69	87	109
15	87	109	137
16	110	138	172
17	137	172	215
18	171	214	267
19	210	263	328
20	256	320	399
21	309	386	481
22	370	461	574
23	438	545	679
24	514	640	796
25	599	745	927
26	693	862	1072
27	796	990	1232
28	910	1132	1408
29	1034	1287	1602
30	1168	1456	1814
31	1312	1637	2043
32	1464	1830	2287
33	1622	2031	2544

Tags

fetus weight gestational age comparison

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Views: 2338

Uses: 783

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) normal reference values for estimated fetal weight (EFW) in Asian singleton fetuses. This tool clearly displays the "low (3rd percentile)", "standard (50th percentile)", and "high (97th percentile)" ranges for fetal weight at various gestational ages from 10 to 42 weeks, in grams (g). It aims to help expectant parents and medical professionals quickly look up and assess whether fetal growth and development are within the normal range, serving as an important reference for monitoring fetal health during pregnancy.

How to Use

Find Your Gestational Age: First, you need to know the pregnant woman's precise gestational age (in weeks).
Locate 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.
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 input data; they simply look up values in the table based on gestational age.
Output Result Format: Displayed in a table, 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 gestational age and wants to inquire about the fetal weight reference range.

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

Gestational Age (Weeks)	Low (3rd)	Standard (50th)	High (97th)
28	910	1132	1408

Result Interpretation: According to the table, for an Asian singleton fetus at 28 weeks gestational age, 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 are the data sources and applicable population for this reference table? A: The data for this tool is based on the NICHD (National Institute of Child Health and Human Development) normal reference values for estimated fetal weight in Asian singleton fetuses. Therefore, it is primarily applicable to pregnant women of Asian ethnicity with singleton pregnancies.
Q: How do 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 the 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 the upper critical value. These percentiles help assess the relative position of fetal weight within the population.
Q: What should I do 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 falls into 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. Do not self-diagnose or take action.
Q: What is the formula for estimated fetal weight (EFW)? A: Estimated fetal weight (EFW) is typically calculated by measuring multiple fetal biological indicators (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 offers reference ranges based on these calculation results.

Notes

Data Applicability: Please note that the data in this reference table is specifically for Asian ethnicity and singleton pregnancies. If you are non-Asian or have a multiple pregnancy, the reference value of this table may be limited. Please be sure to consult your doctor for 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. The actual development of the fetus is affected 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 communicate with your obstetrician in a timely manner to obtain an accurate assessment and guidance.