however , ristocetin-induced platelet aggregation ( ripa ) with a final concentration 1.12 mg/ml was markedly abnormal-absent or virtually absent in 9 of 10 patients with sca , 3 of 3 patients with hemoglobin s-c disease , and 2 of 3 patients with sickle trait .
C0002895
sca
C0019034
hemoglobin s-c