Test Name: Pregnancy Loss Microarray
Also known as: POC Array
Indications for Testing:
- Pregnancy loss at any gestational age
- Evaluates hundreds of different genetic conditions, including aneuploidy, with one test
- Detects large and small deletions and duplications, many of which are undetectable by traditional chromosome analysis
- Significantly reduces the test failure rate seen with traditional cytogenetic methods because no cell culture is needed
- Helps to rule out maternal cell contamination
- Cannot identify all genetic conditions or the cause of all birth defects or pregnancy losses
- Does not detect changes in the DNA sequence of genes
- Cannot detect balanced chromosome rearrangements (less likely the cause of a pregnancy loss)
- Unable to reliably detect all cases of mosaicism
- A normal result indicates no clinically-significant chromosome anomalies were identified.
- An abnormal or pathogenic result indicates that a chromosome anomaly was identified that likely provides an explanation for the pregnancy loss.
- In some cases, the clinical significance of an identified chromosomal anomaly may not be well understood in the context of a pregnancy loss. These anomalies will be reported as variants of uncertain clinical significance.
- Parental testing may be recommended in order to clarify whether the result is de novo or familial for the purpose of recurrence risk calculation.
- In some circumstances, a result will be unavailable. These cases include testing on samples without sufficient fetal DNA or when maternal cell contamination cannot be ruled out.
- In addition to fetal tissue, a maternal blood sample is recommended to rule out maternal cell contamination, which ensures that the microarray results are representative of the fetus rather than the mother.
- Pregnancy Loss Microarray does NOT analyze the mother’s chromosomes. This testing is available at our laboratory but must be ordered as a separate test.
Required forms: Pregnancy Loss Test Request Form
Other forms: Request for Pre-Authorization for Genetic Testing (Pregnancy Loss)
Specimen Collection & Shipping
Specimen Requirements: Test kits are available – please contact the laboratory
NOTE: Comprehensive results are best achieved when maternal blood* is analyzed in addition to POC tissue.
- Fetal tissue: 1 cm3fetal tissue in tissue culture media or phosphate buffered salineor FFPE block
- Maternal blood*: 2 ml whole blood in sodium heparin tube (green top)
- Tissue, paraffin embedded: 3 curls of 25-30 microns thick of confirmed fetal tissue
* If patient’s pregnancy was the result of egg donation, draw paternal blood and not maternal blood.
- Preferred fetal tissue sample sites include buttocks or thigh. If fetal tissue is not available placental villi can be utilized. Separate villi from maternal blood and deciduas to reduce the chance for maternal cell contamination.
- CVS: 81229, 88235
- Fetal and Placental Tissue: 81229, 88233
- Paraffin / FFPE: 81229
Pricing: Contact the laboratory billing staff for current costs
Turn-Around-Time: Results are typically available in 1 week on fetal tissue; 2 weeks on FFPE tissue.