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ACHE_ -M
ACETYLCHOLINESTERASE, AMNIOTIC FLUID (ACHE-AF), AMNIOTIC FLUID

Test Code ACHE_ -M 
Test ACETYLCHOLINESTERASE, AMNIOTIC FLUID (AChE-AF), AMNIOTIC FLUID 
Methodology Polyacrylamide Electrophoresis 
Description Useful for open tube defects and, to a lesser degree, ventral wall defects. 
Specimen 1.0 mL of uncentrifuged amniotic fluid. A specimen from the 16 -18 week gestational period of pregnancy is preferred. Amniotic fluid from the 14 - 21 week gestational period is acceptable. Send specimen refrigerated.

NOTE:
1. GESTATIONAL AGE IS REQUIRED ON REQUEST FORM FOR PROCESSING.
2. If chromosome studies are also requested, see "Chromosome Analysis, Amniotic Fluid." The specimen for AChE testing when requested with chromosome analysis cannot be FROZEN.
3. Please complete a Cytogenetics / AFP Congenital Disorders Request Form and forward with the specimen. 

Reference Values Negative (reported as negative [normal] or positive [abnormal] for inhibitable AChE)
Reference values were established in conjunction with alpha-fetoprotein testing and include only amniotic fluids from pregnancies between 14 and 21 weeks gestation. 
Analytic Time 7 Days 
Day(s) Test Set Up Wednesday 
CPT Code(s) 82013