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New prenatal tests provide clearer answers sooner


4 Star

New prenatal tests provide clearer answers sooner

Our Review Summary

This story discusses first trimester screening for prenatal chromosomal abnormalities, namely Down syndrome. A study in the New England Journal of Medicine (NEJM) looked at sequential screening of women 10-13 weeks into their pregnancy, instead of the typical 16 week screening. Combining blood tests and ultrasound screening succeeded in finding 87% of Down fetuses (though a positive test is still only a prediction of increased risk that a baby will be born with Down syndrome). The journalist did not mention the false positive rate of the 1st trimester vs. 2nd trimester screenings in the NEJM study, nor the study design. However, a discussion of what constitutes a “positive” result of screening was a plus for this story. The story also was balanced in presenting the risks of screening and the risk of miscarriage due to subsequent diagnostic tests, such as chorionic villus sampling or CVS (sampling cells via a thin tube or needle inserted into the placenta) and amniocentesis. There was no discussion of the cost of these tests earlier in the


Does the story adequately discuss the costs of the intervention?

Not Satisfactory

No information about the cost

of the screening or diagnostic tests, either alone or in combination. No information if both forms of testing in first

trimester are covered by insurance.

Does the story adequately explain/quantify the harms of the intervention?


Mentions harms of miscarriage with the

CVS testing and amniocentesis. Briefly mentions psychological harm of screening if you do not want to go through with more

risky diagnostic tests–more anxiety during the pregnancy if you have a positive Down result in screening.

Does the story seem to grasp the quality of the evidence?

Not Satisfactory

No mention of study design, although

discussion of design in this case (sequential treatment for all participants vs. randomization to control and treatment

groups) was not crucial to interpreting results of the study. No mention of false positive rate. (About 5% with first

trimester combined screening.)

Does the story commit disease-mongering?


Frames risk factors of more invasive diagnostic tests and the

risk of screening (in terms of anxiety if you choose not to have the further tests).

Does the story use independent sources and identify conflicts of interest?


Potential conflict of interest is not discussed, but there are a number of local experts in

ob/gyn quoted, however no patients. Nobody cited affiliated with the New England Journal of Medicine study, upon which the

story is based.

Does the story compare the new approach with existing alternatives?


Mentions alternatives of second trimester testing or no screening at all, but seems to promote the

screening. Gives estimate of miscarriage with diagnostic tests.

Does the story establish the availability of the treatment/test/product/procedure?

Not Satisfactory

Story address the

greater demand for 1st trimester testing, but does not address availability in smaller hospitals, nor is there a discussion

that there is specialized training and a certification process for nunchal translucency (the ultrasound test) for both

sonographers and physicians.

Does the story establish the true novelty of the approach?


Mentions that combination of

screening methods provide greater accuracy sooner in pregnancy. Neither is a “new’ test, however.

Total Score: 7 of 10 Satisfactory


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