| gestation | <obstetrics> The period of development of the young in viviparous animals, from the time of fertilization of the ovum until birth. Origin: L. Gestatio, from gestare = to bear (18 Nov 1997) |
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| gestation sac | The gestation sac is the fluid-filled sac in which the foetus develops, visible with an ultrasound exam. (09 Oct 1997) |
| gestational age | <obstetrics> Foetal age of a newborn, calculated from the number of completed weeks since the first day of the mother's last menstrual period to the date of birth. (27 Sep 1997) |
| gestational diabetes | A glucose intolerance which occurs in pregnancy, usually noticed between the 24th and 28th weeks of pregnancy. In most cases the blood glucose level returns to normal after delivery. Although the symptoms of this form of diabetes are mild and nonserious for the mother, elevated blood glucose in the mother has been associated with an increased risk of foetal and newborn death. Risk factors for gestational diabetes include maternal age over 25, family history of diabetes, obesity, birth weight over 9 lb in a previous delivery or a history for congenital birth defect or death, in a previous newborn. (27 Sep 1997) |
| gestational oedema | Occurrence of a generalised and excessive accumulation of fluid in the tissues of greater than 1+ pitting after 12 hours' bed rest, or of a weight gain of 5 pounds or more in 1 week due to the influence of pregnancy. (05 Mar 2000) |
| gestational proteinuria | The presence of proteinuria during or under the influence of pregnancy in the absence of hypertension, oedema, renal infection, or known intrinsic renovascular disease. (05 Mar 2000) |
| gestational psychosis | An obsolete term for psychotic reaction with morbid depressive features associated with pregnancy. See: postpartum psychosis, puerperal psychosis. (05 Mar 2000) |
| gestational sac | <radiology> Arises from blastocyst which implants into secretory endometrium surrounded by echogenic trophoblast sac size: 6th week = 17mm;, 8th week = 31 mm, fills chorionic cavity by 12th week visualization of gestational sac, relative to beta-hCG levels: transabdominal scan: greater than 1800 IU/l, transvaginal scan: less than 500 IU/l = 20%, 500-1000 IU/l = 80%, greater than 1000 IU/l = 100%, relative to menstrual age, transabdominal scan: earliest by 5.5 weeks (10-12mm), transvaginal scan: routinely seen by 5-5.5 weeks see: double decidual sac (12 Dec 1998) |
| gestational trophoblastic disease | (choriocarcinoma, molar pregnancy) a type of cancer associated with pregnancy in which a grape-like mole develops in the womb instead of a foetus. (16 Dec 1997) |
| multiple gestation | <radiology> Incidence: 1% of all births, twins in 1:85; triplets in 1:85x85; etc, uterus large for dates, may have elevated hCG, hPL, and aFP, at risk for IUGR: monochorionic-monoamniotic more than , monochorionic-diamniotic more than , dichorionic-diamniotic findings: 2 placentas indicate dichorionic-diamniotic, 1 placenta indicates monochorionic pregnancy or dichorionic pregnancy with fused placenta, separating membranes confirms diamniotic pregnancy (12 Dec 1998) |
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