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False‐positive amniotic fluid acetylcholinesterase analysis in the third trimester
Author(s) -
Suchy Sharon F.,
Yeager Maria T.
Publication year - 1993
Publication title -
prenatal diagnosis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.956
H-Index - 97
eISSN - 1097-0223
pISSN - 0197-3851
DOI - 10.1002/pd.1970130508
Subject(s) - amniotic fluid , acetylcholinesterase , obstetrics , medicine , third trimester , second trimester , pregnancy , gynecology , andrology , gestation , fetus , biology , enzyme , genetics , biochemistry
Thirty‐two third‐trimester amniotic fluid samples were studied according to the indication for amniocentesis, result of acetylcholinesterase (AChE) analysis, and outcome, in order to address the issue of the effectiveness of AChE testing late in gestation. The results indicate that third‐trimester AChE analysis is less effective than second trimester in distinguishing open neural tube defects (ONTDs) and ventral wall defects (VWDs) from other abnormalities. False‐positive results occurred in cases of isolated hydrocephaly (four of seven cases), polyhydramnios, and intrauterine growth retardation (IUGR). Caution is recommended in interpreting third‐trimester AChE tests, particularly when neither an ONTD nor a VWD is observed by ultrasound.