A Chinese family with concurrent hereditary spherocytosis (HS) and haemoglo
bin (Hb) Q-Thailand is described. The Hb Q-Thailand mutation was found on t
he remaining alpha1 globin gene on a chromosome 16 containing the (-alpha (
4.2)) deletion. Active haemolysis in members of this family is segregated w
ith the HS phenotype, and the Hb Q-Thailand in the heterozygous state does
not seem to show any modulating effect on HS.