Am.J.Dis.Child.118:454, 1969 K.I. Kramer, Advancement of dermal icterus in the jaundiced newborn. This is the graph I've seen, I'm not sure of validity or current up-dates. Full term LBW Dermal zone 1: Head and neck 4-7 Dermal zone 2: Trunk to umbilicus 5-12 5-12 Dermal zone 3: Groin inc. upper thigh 8-16 7-14 Dermal zone 4: Knees and elbows to ankles and wrists 11-18 9-18 Dermal zone 5: Feet & hands inc. palms and soles >15 >10 FYI: I've used this in talks and have it on a "yellow" overhead! Pat in SNJ