Subjective: A hand or foot with more than five digits that has a recognizable A/P axis of symmetry. The axis can lie within a normally formed or partially duplicated digit resembling a middle finger, index finger, thumb, toe, or hallux. Alternatively, the axis can be in an interdigital space with a flanking pair of digits that resemble a middle finger, index finger, thumb, toe or hallux. The most lateral digits on each side of the hand typically resemble fifth fingers/toesComments:
This is considered to be a subjective assessment. Although polydactyly is obviously objective, the assessment of the A/P symmetry component is arguably subjective. It may be associated with a forearm that has two ulnae, but this is not required for the finding to be made.