When all results for trisomies 21 and 18 were combined, the researchers found that the false-positive rates
for standard screening were 4.
by Preparation Type (N = 494) (a) Preparation Type Smears Papanicolaou Modified Giemsa Cytocentrifuged (N = 323) (N = 139) Specimen (N = 32) False-positive rate
, % 15.
Perhaps the most striking aspect of the second-tier test relates not only to its ability to reduce false-positive rates
derived from screening for the primary metabolite of a disorder but also to its capacity to expand the number of disorders by using the same screen for the same metabolite as a secondary metabolite for other diseases.
However, Carriquiry says that the 27 percent false-positive rate
is not informative.
The detection rate of Doppler ultrasound was slightly lower than that for saline infusion, whereas the false-positive rate
of Doppler is around five times higher.
Effectively, for PPV to support an expectation of a positive being more likely correct than not (PPV > 50%), the false-positive rate
, [alpha], must be less than double the likelihood of the hazard, P[H], a specification for a monitoring method that is challenging to provide for very low-frequency hazards.
Using the conventional 1:270 second-trimester cutoff for anticipated cases of aneuploidy, six of the seven cases screened positive, however, the price was an additional false-positive rate
Screening results for trisomy 18 carried a false-positive rate
Significant Reduction of False-Positives: Saves time and man-hours for IT administrators with a significantly reduced false-positive rate
In one study conducted during the second trimester of pregnancy, ITA alone detected 78% of the Down syndrome cases at a 5% false-positive rate
She adds, however, that the test has a false-positive rate
of 4 percent, which means that 4 percent of patients who test positive do not in fact have the cancer.
7%, which was significant, but the false-positive rate
increased by 18%, which did not meet the prehypothesis that the false-positive rate
would not exceed 15%.