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This section is an attempt to present an overview of the most basic prenatal tests most pregnant women in the US are pressured to have, including Ultrasounds, the AFP/Triple Screen Test, Gestational Diabetes tests, and under certain conditions, Amniocentesis.

It is further designed to address the special concerns that large women might have in taking these tests---their fears, any special equipment or techniques that might be helpful, the controversies over interpretation of results, whether large women have a higher rate of so-called 'false-positives' on certain tests and why, etc.

For related information, see Medscape's Pregnancy Resource Center.

Gestational age (GA) refers to the length of pregnancy after the first day of the last menstrual period (LMP) and is usually expressed in weeks and days. Conceptional age (CA) is the true fetal age and refers to the length of pregnancy from the time of conception.

The date of feeling the first fetal movements (quickening) is far too unreliable to be useful.

The date of the first documented positive pregnancy test and the beta-human chorionic gonadotropin (b HCG) level may help ascertain the minimum gestational age.Accurate dating early in pregnancy is essential for a diagnosis of IUGR.Ultrasound biometry is the gold standard for assessment of fetal size and the amount of amniotic fluid.research any test before deciding whether to use it or not. For more information on prenatal testing, see the FAQs available from info on the Internet. Testing decisions vary greatly depending on family history, medical condition, parental beliefs, etc.Preterm delivery is indicated if the fetus shows evidence of abnormal function on biophysical profile testing.

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