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| Sensitivity | Probability that a screening test will be positive if pregnancy is affected |
| Specificity | Probability that the screening test will be negative if pregnancy is unaffected |
| PPV* | The probability that a pregnancy is affected if the test is positive |
| NPV* | The probability that a pregnancy is unaffected if the test is negative |
Both PPV and NPV are dependent upon the disease prevalence or a priori risk.
