2 doctors weighed in:

Does everyone with single palmar lines on their palms have down's syndrome?

2 doctors weighed in
Dr. James Ferguson
Pediatrics
1 doctor agrees

In brief: No

The four finger (rather than 3) palmar crease appears on at least one hand in a percentage of normal individuals, about 7% if memory serves me well.

In brief: No

The four finger (rather than 3) palmar crease appears on at least one hand in a percentage of normal individuals, about 7% if memory serves me well.
Dr. James Ferguson
Dr. James Ferguson
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