The incidence of a positive Coombs test in 47 unselected patients receiving methyldopa in hypertension clinics§ in Boston was 10.6 per cent. Three of these patients, 2 patients referred to us ...

Direct Coombs tests using antiserum to human L chains of Types 1 and 2 were both negative; with the use of antiserum to human H chains, the direct Coombs test was positive to a titer of 1:64. Figure 1 ...