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HelpTest Code LAB0207399 Acetylcholinesterase, Amniotic Fluid
Additional Codes
| Mayo Test ID |
|---|
| ACHE_ |
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Useful For
Diagnosing open neural tube defects and, to a lesser degree, ventral wall defects
Special Instructions
Method Name
Polyacrylamide Electrophoresis
Reporting Name
Acetylcholinesterase, AFSpecimen Type
Amniotic FldAdditional Testing Requirements
If chromosome studies are also requested, see CHRAF / Chromosome Analysis, Amniotic Fluid for specimen requirements. When requested with chromosome analysis, the specimen cannot be frozen.
Necessary Information
1. Gestational age at amniocentesis is required.
2. If not ordering electronically, provide gestational age on Second Trimester Maternal Screening Alpha-Fetoprotein / Quad Screen Patient Information (T595) and send with specimen.
Specimen Required
Container/Tube: Amniotic fluid container
Specimen Volume: 1 mL
Collection Instructions: Specimen must be collected between 14 to 21 weeks gestation; 14 to 18 weeks is preferred.
Specimen Minimum Volume
0.3 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Amniotic Fld | Refrigerated (preferred) | 365 days | |
| Frozen | 365 days | ||
| Ambient | 14 days |
Reject Due To
| Gross hemolysis | OK |
| Gross icterus | OK |
Reference Values
Negative (reported as negative [normal] or positive [abnormal] for inhibitable acetylcholinesterase)
Reference values were established in conjunction with alpha-fetoprotein testing and include only amniotic fluids from pregnancies between 14- and 21-weeks gestation.
Interpretation
The presence of acetylcholinesterase in amniotic fluid is consistent with open neural tube defects and, to a lesser degree, ventral wall defects.
Day(s) Performed
Tuesday, Thursday
Report Available
3 to 7 daysSpecimen Retention Time
60 daysTest Classification
This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
82013
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| ACHE_ | Acetylcholinesterase, AF | 30106-9 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 9287 | Acetylcholinesterase, AF | 30106-9 |
| GACHE | Gestational Age (ACHE) | 18185-9 |