How to draw a Pedigree
How to Draw a Pedigree
Please follow the instructions below when creating a pedigree. Additional resources can be
found here: http://www.nsgc.org/About/FamilyHistoryTool/tabid/226/Default.aspx
Bennett, R.L., French, K.S., Resta, R.G. & Doyle, D.L. Standardized human pedigree
nomenclature: update and assessment of the recommendations of the National
Society of Genetic Counselors. J Genet Couns 17, 424-33 (2008).
The following information must be included on the pedigree:
First name or initials of relatives (To maintain confidentiality do NOT use full
names; alternatively, use generation-individual numbers (I-1, I-2, II-1). Please limit
identifying information to be compliant with HIPAA guidelines.)
Affected status (i.e. who in the family has disease) for each individual in the family
Age of all family members, or age at death (To be compliant with HIPAA guidelines,
please do not submit a full birth date at this time.)
Whether individuals are living or deceased. Cause of death, if known, should be
indicated below the symbol.
Residence for all family members (City, State)
Willingness to participate in the study (indicate with an asterisk)
Key to shading of symbols
Adoption status
Consanguinity (i.e. parents are related)
Race and ethnicity
Date pedigree obtained
General guidelines:
It is helpful to start in the middle of the page when drawing a pedigree.
Male partners are to the left of female partners.
Siblings are drawn from oldest to youngest with the oldest listed on the left and the
youngest on the right.
If there are multiple disorders or diseases, use quadrants or different shading (solid,
cross-hatching) to indicate each disease (see examples)
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