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    • Examination Protocols - Infant Head Circumference for Age Percentiles (< 36 months)

    CDC/NCHS Infant Head Circumference for Age Percentiles (< 36 months)

    Input:
    Sex Female

    		 Male
    Age
    Head Circumference
    Results:
    Z Score  
    Percentile  
     
    Decimal Precision:
    Head Circumference for Age Percentile Interpretation
    Percentile < 3:Microcephaly
    Percentile >= 3 and < 97:Normal head circumference
    Percentile >= 97:Macrocephaly
    • Microcephaly is a Head Circumference greater than two standard deviations below the mean.
    • Macrocephaly is a Head Circumference greater than two standard deviations above the mean.
    • At the extremes (>97th percentile or <3rd percentile), small differences in percentiles represent clinically important differences in head circumference. At these extremes, the z-score is a more precise reflection of how far the measurement deviates from the mean, and is a useful tool for tracking changes.
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