MOBILE VIEW  | 

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.
Legal Notices and Disclaimer
All information contained in and produced by JoDrugs is provided for educational purposes only. This information should not be used for the diagnosis or treatment of any health problem or disease. THIS INFORMATION IS NOT INTENDED TO REPLACE CLINICAL JUDGMENT OR GUIDE INDIVIDUAL PATIENT CARE IN ANY MANNER. Click here for full notice and disclaimer.