Ferrokinetic analyses showing red blood cell utilization of iron 59 in 3 patients with hemoglobin H (HbH) disease and 5 patients with HbH constant spring (HbH/CS).

Solid symbols and dotted lines represent results in patients with HbH disease; open symbols and heavy solid lines, results in patients with HbH/CS; and the thin solid line, the normal value. Values in patients with HbH disease were slightly below normal, whereas comparable values in patients with HbH/CS were reduced to a mean of 59%.