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Is the 15-in situ clone protocol necessary to detect amniotic fluid mosaicism?
American Journal of Obstetrics and Gynecology
|October 1, 1995
Summary
Reducing amniotic fluid mosaicism analysis clones to six significantly improves efficiency and lowers costs. This approach detects most clinically significant cases, with minimal risk of missing autosomal abnormalities.
Area of Science:
- Prenatal Diagnostics
- Cytogenetics
- Genetics
Background:
- Amniotic fluid mosaicism requires careful cytogenetic analysis.
- The in situ method is a standard technique for detecting mosaicism.
- Optimizing analysis protocols is crucial for efficiency and cost-effectiveness.
Purpose of the Study:
- To evaluate the efficacy of a reduced 15-clone analysis for detecting amniotic fluid mosaicism using the in situ method.
- To determine if a shorter clonal analysis can maintain diagnostic accuracy.
Main Methods:
- A retrospective review of 28,497 amniotic fluid samples analyzed over 10 years.
- Exclusive use of the in situ method with sequential clonal analysis.
- Identification of the first and second clones revealing abnormal cell lines.
Main Results:
- Amniotic fluid mosaicism was detected in 0.26% of samples (73 cases).
- Of 54 clinically significant cases, 89% were identified within the first six clones.
- Limiting analysis to six clones could save 20% of analysis time but might miss rare autosomal cases.
Conclusions:
- Reducing the number of clones analyzed can increase efficiency and decrease costs.
- A six-clone analysis offers a balance between efficiency and minimal loss of sensitivity.
- The findings support optimizing the in situ method for amniotic fluid mosaicism detection.