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Ninalia NIPT The prenatal trisomy screening test based on maternal blood sample

 

Results interpretation and procedures to follow:

Positive result How to proceed Results A positive result indicates a strong suspicion that thefoetus is affected by one ofthe anomalies beinginvestigated. Negative result In very rare cases: failed result A negative result indicatesan extremely low riskbut does not completelyrule out the presenceof the anomaly Monitoring of the pregnancyshould remain unchanged In very rare cases,discordant results or a failedresult is possible Discussion with the Biomnisgeneticists to considerhow to proceed (collect anew sample, plan for invasivesampling, perform ultrasoundassessment, etc.) The result must be confirmedby an invasive sample with the aim of performingfoetal karyotype testing, the only examination thatcan confirm the diagnosisof Down syndrome, Edwards'syndrome or Patay syndrome
  • For autosomal aneuploidies (other than trisomy 21, 18 and 13 and imbalances greater than 7 MB):

In these cases, the falses positive rate is higher than in traditionally screened aneuploidies (21, 18, 13 ).

Mosaicism can be seen with any chromosomal anomaly. Its prevalence in rare trisomies and in partial chromosome imbalances is higher than in the trisomies of chromosomes 21, 18, and 13. Confined placental mosaicism can occur leading to a false positive result. In these conditions, the prognosis is variable, and depends on the individual case.

 

As the NIPT is a screening test, results should be considered in the context of the overall pregnancy picture and positive results should be confirmed (for example, by CVS or amniocentesis) prior to making irreversible pregnancy management decisions. A case-by-case discussion should be conducted by health professionals

 

  • For sex chromosome aneuploidies:

There is an increased possibility of false-positive results for sex chromosome aneuploidies as part of the screening test.

Once a positive result is confirmed, it may have a variable prognosis (e.g., Turner syndrome). A case-by-case discussion should be conducted by health professionals prior to making irreversible pregnancy management decisions. Patients should be referred to genetic counsellors to receive accurate, balanced, up-to-date information when an increased risk of sex chromosome aneuploidy is reported after NIPT.

 

Eurofins Biomnis geneticists are available for any question related to the interpretation of the results at international@eurofins-biomnis.com.

 

Results interpretation Results interpretation for trisomy 21, 18 and 13 and procedures to follow

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