TABLE 2

Rates of Positive Screening Results for Iron Deficiency Using 9 CBC Criteria and Corresponding Follow-Up Rates (N = 4984)

Screening TestsNo. of Patients Screened Positivea (%)No. of Patients With Positive Screening Results Retested Within 6 mob (%)
Simple screens
    Hemoglobin level of <11 g/dL715 (14.3)102 (14.3)
    Hemoglobin level of <10.5 g/dL275 (5.5)62 (22.5)
    Hematocrit level of <33%722 (14.5)105 (14.5)
Other screens
    MCV of <70 μm3 and RDW of >14%180 (3.6)31 (17.2)
    MCV of <70 μm3 and RDW of >14.5%156 (3.1)25 (16.0)
    MCV of <70 μm3, RDW of >14.5%, and Mentzer index of >1375 (1.5)10 (13.3)
    MCV of <70 μm3 and hemoglobin level of <11 g/dL118 (2.4)24 (20.3)
    MCV of <70 μm3 and hemoglobin level of <10.5 g/dL74 (1.5)16 (21.6)
    MCV of <70 μm3 and hematocrit level of <33%80 (1.6)20 (25.0)
  • a Defined as infants who were screened for iron deficiency between 9 and 15 months of age during a well-child care evaluation.

  • b Defined as infants who received a follow-up laboratory test 6 months after their initial positive screening test.