As of January 2019, more than 4,000,000 NIFTY® tests have been processed worldwide, more than any other NIPT provider as far as we know, meaning we offer a tried and tested service you can be confident of.
The NIFTY® test has also undergone extensive external validation. We have published the world’s largest study of the clinical performance of NIPT, with data calculated from the outcomes of over 112,000 pregnancies.
Wei Wang et al, Journal of Ultrasound in Obstetrics and Gynecology
|Total number of samples with known pregnancy outcomes in 112,669 cases|
|Trisomy||TP||FP||Sensitivity||Specificity||Positive predictive value(PPV)||Negative predictive value (NPV)
|T18||167||51||98.24% ||99.95%||76.61% ||100%
Click image below to see graphic overview of the study.
Data from three further studies is listed below and more information can be found in the Published Reports section, which lists some of the 31 papers we have published relating to NIPT.
Lau T. K. et al, ‘Non-invasive prenatal testing for fetal chromosomal abnormalities by low-coverage whole-genome sequencing of maternal plasma DNA: review of 1982 consecutive cases in a single center’, Ultrasound Obstet Gynecol 2014; 43: 254–264
|Total||Trisomy 21||Trisomy 18||Trisomy 13|
|Follow Up Investigation||1645||0||0||0|
|False Positive Rate||-||0%||0%||0%|
|False Negative Rate||-||0%||0%||0%|
Dan S. et al, ‘Clinical application of massively parallel sequencing-based prenatal noninvasive fetal trisomy test for trisomies 21 and 18 in 11,105 pregnancies with mixed risk factors.’ Prenat. Diagn., 32: 1225–1232. doi: 10.1002/pd.4002
|No. of Cases||Positive Results||Negative Results|
|NIFTY Positive||11,105||140 (3)||42 (5)||0||10,915|
|Karyotyping *||182 + 2818||139||41||0||2820|
|False Positive Rate||0.03%||0.03%||N/A|
|False Negative Rate||0.00%||0.00%||N/A|
Double-blinded Validation on 3,464 NIFTY™ Blood Samples
|Trisomy 21||Trisomy 18||Trisomy 13|
|False Positive No.||1*||1*||0|
|False Negative No.||0||0||0|
|False Positive Rate||0.03%||0.029%||0.00%|
|False Negative Rate||0.00%||0.00%||0.00%|
|Positive Predictive Rate||99.49%||98.44%||100.00%|
International Society for Prenatal Diagnosis ISPD
Prenat Diagn 2012;32:1-2
Association of Privately Practising Prenatal Medical Professionals BVNP
German Human Genetics Society GfH
The American College of Obstetricians and Gynecologists Committee on Genetics and
The Society for Maternal-Fetal Medicine Publications Committee ACOG