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Large for gestational age (LGA)

Definition

Large for gestational age (LGA) means that a fetus or infant is larger or more developed than normal for the baby's gestational age.

Information

Gestational age is a measure of the growth and development of the fetus in the uterus and the infant after birth. LGA refers to a fetus or infant who is larger than expected for the age and gender or with a birth weight above the 90th percentile.

The measurement is based on the estimated gestational age of the fetus or infant, compared with what is considered normal height, weight, head size, and developmental level for a fetus or infant of the same age and gender.

Common causes of a fetus or infant who is large for gestational age are:

  • Gestational diabetes
  • Prolonged pregnancy

A baby that is large for gestational age has a higher risk of birth injury and complications of low blood sugar after delivery.

References

Carlo WA. Large for gestational age infants. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 91.4.


Review Date: 8/12/2011
Reviewed By: Linda J. Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington, School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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