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NWS-22 Data Details

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NWS-22 Reduce iron deficiency among pregnant females

About the Data

Description of the data source, numerator, denominator, survey questions, and other relevant details about the national estimate.

Data Source: 
National Health and Nutrition Examination Survey
Changed Since the Healthy People 2020 Launch: 
Baseline (Year): 
16.1 (2003–06)
Target-Setting Method: 
10 percent improvement

Number of pregnant women with body iron less than zero.


Number of pregnant women

Comparable Healthy People 2010 Objective: 
Retained from HP2010 objective
Data Collection Frequency: 
Methodology Notes: 

    Body iron is defined as follows: Body iron (mg/kg) = -[log10 (sTfR X1000/ferritin)-2.8229]/0.1207, where sTfr is serum transferrin receptor in milligrams per liter and ferritin is serum ferritin in micrograms per liter.

Caveats and Limitations: 
Iron deficiency status varies by trimester. Future analyses of overall prevalence of iron deficiency will need to standardize to the trimester distribution in 2003-2006 NHANES.

Revision History

Any change to the objective text, baseline, target, target-setting method or data source since the Healthy People 2020 launch.

Description of Changes Since the Healthy People 2020 Launch: 
In 2014, the baseline data for the age group 25-44 was revised from 13.9 to 13.8 percent due to a programming error in the original estimate.


Additional resources about the objective

  1. Cook JD, Flowers CH, Skikne BS. The qualitative assessment of body iron. Blood 2003; 101:3359-34.
  2. Skikne BS, Flowers CH, Cook JD. Serum transferrin receptor: a qualitative measure of tissue iron deficiency. Blood 1990; 75:1870-1876.