TABLE 2.

Plasma haptoglobin concentrations before, 1, and 24 hours after transfusion of BioRBCs

Subject	Time	Plasma free hemoglobin (mg/dL)	Haptoglobin
1	Before transfusion	6	70
	60 minutes	83	52
	24 hours	10	61
2	Before transfusion	3	71
	60 minutes	11	66
	24 hours	7	65
3	Before transfusion	29	32
	60 minutes	54	38
	24 hours	27	49
4	Before transfusion	7	85
	60 minutes	9	70
	24 hours	10	72
5	Before transfusion	11	86
	60 minutes	8	71
	24 hours	5	89
6	Before transfusion	0	<20
	60min	40	<20
	24 hours	2	<20
7	Before transfusion	22	77
	60 minutes	5	64
	24 hr	29	80
8	Before transfusion	3	114
	60 minutes	25	95
	24 hours	7	108

Laboratory normal ranges are 0–5 mg/dL for plasma free hemoglobin and 30 to 200 mg/dL for plasma haptoglobin.