[Initial action of synthetic sexual steroids on serum-haptoglobin concentration (author's transl)].

Sera of 21 clinically intact women, who had been on Non-ovlon, Gravistat or Deposiston, were tested for their haptoglobin levels, during two control cycles and in the first three cycles on contraceptives. Serum-haptoglobin concentrations were reduced. A primary role is played, in that context, by oestrogens.