Table 2.

Performance characteristics of ultrasound diagnostic criteria for individuals who are born with 50% risk for PKD1a

Age Group (yr)Diagnostic CriterionSensitivity (%)Specificity (%)NPV (%)PPV (%)
15 to 29At least two renal cysts  (unilateral or bilateral)approximately 96100approximately 97100
30 to 59At least two cysts in each kidney100100100100
60 or olderFour or more cysts in each kidney100100100100
  • a Data derived from reference (34). NPV, negative predictive value; PPV, positive predictive value.