The serum gamma-glutamyl transferase (GGT) activity correlated signifi
cantly (P < 0.008) with the platelet count in 55 patients with thrombo
cytosis. All patients were selected so as to have normal liver functio
n tests (including serum GGT), This correlation was present in both ge
nders and there was no significant correlation with the other liver fu
nction tests, These findings are additional evidence that platelets ma
y contribute to the total serum GGT activity.