gestational age

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Related to Weeks of gestation: gestational age


1. the duration, or the measure of time of the existence of a person or object.
2. to undergo change as a result of passage of time.
achievement age a measure of achievement expressed in terms of the chronologic age of a normal child showing the same degree of attainment.
chronologic age the actual measure of time elapsed since a person's birth.
developmental age
1. age estimated from the degree of anatomical development.
2. in psychology, the age of an individual determined by degree of emotional, mental, anatomical, and physiological maturation.
gestational age see gestational age.
mental age the age level of mental ability of a person as gauged by standard intelligence tests.


pertaining to gestation.
gestational age the estimated age or stage of maturity of a conceptus. Gestational age of the newborn infant can be estimated by noting various physical characteristics that normally appear at each stage of fetal development. Gestational age assessment of the newborn is facilitated by using a scoring system such as the one developed by Dubowitz and Dubowitz, or a modification of it by Ballard.

As the preterm newborn emerges from the birth canal it will be covered with a rather heavy coating of vernix caseosa; the full-term newborn has only a small amount of this cheeselike substance in body creases and the hair. By the 40th to 42nd week of gestation the skin of the newborn is pale and opaque, whereas the skin of the baby born before this period of gestation may be thin and transparent; venules can be seen under the skin on the abdomen.

At about 20 weeks the body is covered with fine hair called lanugo, which begins to disappear as maturation continues, first from the face, then the trunk, and finally from the extremities. At nine months gestation lanugo is usually seen only over the shoulders. Wrinkling of the soles of the feet is another indication of the newborn's gestational age. It occurs first near the toes and progresses toward the heels so that by the 40th week the entire sole is covered with creases. The preterm newborn will have smooth soles with only a few creases. “Cotton wool” hair that tends to stick together in small bunches so that it is difficult to distinguish one strand from another is common until the 38th week of gestation. This sign is of less significance in black infants. Cartilage of the ear can also be used to assess gestational age. Until about 32 or 33 weeks the pinnae stay folded when bent inward; by 36 weeks they spring back when released. At term they are firm enough to stand erect from the sides of the head.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

ges·ta·tion·al age

1. in obstetrics, the developmental age of a fetus, usually based on the presumed first day of the last normal menstrual period.
2. in embryology, this term is superfluous because gestation does not begin until fertilization of an oocyte occurs around the middle of the menstrual cycle.
Farlex Partner Medical Dictionary © Farlex 2012

ges·ta·tion·al age

(jes-tā'shŭn-ăl āj)
The age of a fetus expressed in elapsed time since the first day of the last normal menstrual period.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

Gestational age

The estimated age of a fetus expressed in weeks, calculated from the first day of the last normal menstrual period.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.

ges·ta·tion·al age

(jes-tā'shŭn-ăl āj)
In obstetrics, developmental age of a fetus, usually based on presumed first day of last normal menstrual period.
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
The scientists found that deliveries that took place after 41 weeks of gestation or beyond had a greater risk of stillborns or newborn deaths within the first 28 days of delivery.
Screening for pre eclampsia and fetal growth restriction by uterine artery Doppler at 11-14 weeks of gestation. Ultrasound Obstet Gynecol 2001; 18(6): 583-6.
A study from Bangladesh5 reported a case of Ebstein anomaly which presented at 34 weeks of gestation. The woman underwent spontaneous pre-term labour and gave birth to a still born.
A 29-year-old pregnant woman was referred at 22 weeks of gestation because the fetal heart was suspected to be abnormal in a routine ultrasound examination.
A 16-year-old, Sinhala ethnic Sri Lankan woman in her first pregnancy, was admitted with severe preeclampsia at 29 weeks of gestation. She has made her booking visit at ninth week of gestation and all the booking investigations were normal except for the platelet count which was 112,000 per liter.
In current obstetric practice, the use of antenatal corticosteroids in women delivered after 34 weeks of gestation for an obstetric indication still remains controversial.
* ESTATE'S CLAIM: The standard of care for placenta accreta requires delivery between 34 and 36 weeks of gestation. The mother died from a placental abruption and amniotic fluid embolism.
The exclusion criteria were: (1) Multiple pregnancies (2) Uncertainty of LMP (3) Latent/overt diabetes mellitus (4) Pregnancy induced or chronic hypertension (5) History of maternal smoking (6) Rhesus (Rh) incompatibility (7) Fetal anomaly (or anomalies) detected on ultrasonography (8) Transverse lie after 34 weeks of gestation and (9) Any chronic maternal illness like tuberculosis, chronic liver disease or malignancy.
We started the study at 28 weeks of gestation, because the umbilical artery usually has end diastolic flow with mature waveforms at 28 weeks and before 28 weeks, absence of end diastolic flow can be a normal phenomenon.
Eleven of the infants were born within 37-41 weeks of gestation. The remaining two were born at 35-36 weeks of gestation, considered "preterm" by the investigators.
The objective of the study was to determine the perinatal outcome of elective induction with expectant management in elderly nulliparous women [greater than or equal to]35 years of age at term ([greater than or equal to] 39 weeks of gestation)