The "Chicken Pox in Pregnancy" - decision support system (RCOG guidelines all grade C)

Decision support for INFECTION with CHICKENPOX (Varicella) DURING PREGNANCY.
Click if CONTACT rather than infection is the problem.

Date of LMP (Mnth/date/yr) or scan EDD or Date of actual delivery
Date of development of rashAll dates US formatmonth/date/year format
Check out appearance of vesicular rash or crusted rash 

This calculator is for educational use. The decision support is incomplete. However what is presented is believed accurate. No responsibility for accuracy of the results is accepted by the author. Anyone with a little programming knowledge could complete all the possible options. David J R Hutchon BSc, MB, ChB, FRCOG Consultant Obstetrician, Memorial Hospital, Darlington, England.
Comments and suggestions are welcome and will be included in the comments section.


On occassion a sibling has Varicella around the time mother and newborn baby are due for discharge from hospital. If the mother is immune to Varicella the risk to the newborn is minimal. However, if she is not immune the newborn and the mother should be given VZ IgG.

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Details of exposure A brief normal household contact of up to five minutes is not considered significant. Any thing more than this carries an increasing risk of contamination by the virus.
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RCOG Greentop Guidelines on chickenpox in pregnancy