The National Institute of Child Health and Human Development has defined three categories of intrapartum fetal heart rate patterns
Category I Normal
Category II Indeterminate
Category III Abnormal
The above chart is a derivative work of the charts produced by Drs. Julian T. Parer, MD, PhD and Emily F. Hamilton, MD. You are free to use our chart for educational purposes. However, please contact Dr Parer or Dr. Hamilton for permission to use the above chart for commercial purposes.
Macones GA et al., The 2008 National Institute of Child Health and Human Development Workshop Report on Electronic Fetal Monitoring Update on Definitions, Interpretation, and Research Guidelines Obstetrics & Gynecology 2008;112:661-666 PMID:18757666
Jackson M, et al. Frequency of fetal heart rate categories and short-term neonatal outcome. Obstet Gynecol. 2011 Oct;118(4):803-8.PMID:21897312
Parer JT, Ikeda T.A framework for standardized management of intrapartum fetal heart rate patterns. Am J Obstet Gynecol. 2007 Jul;197(1):26.e1-6.PMID:17618744
Parer JT, Hamilton EF.Comparison of 5 experts and computer analysis in rule-based fetal heart rate interpretation.Am J Obstet Gynecol. 2010 Nov;203(5):451.e1-7. Epub 2010 Jul 15.PMID:20633869
Barber EL, et al. Indications contributing to the increasing cesarean delivery rate.
Obstet Gynecol. 2011 Jul;118(1):29-38. PMID:21646928