| Average risk | Moderate risk | High risk |
| • No known family history, OR • Only one second-degree relative (or more distantly related relative) affected | • One first-degree relative with disease onset at an average age, OR • Two affected second-degree relatives on the same side of the family | • Premature disease or unusual presentation in a first-degree relative, OR • Two or more first-degree relatives on the same side of the family affected, OR • Two or more second-degree relatives on the same side of the family affected, with at least one having premature disease onset, OR • Three or more affected on the same side of the family, OR • Moderate-risk status on both sides of the family |
