Condition	Description	vWF:RCo (IU per dL)	vWF:Ag (IU per dL)	Ratio of vWF:RCo to vWF:Ag	Factor VIII
Type I	Partial quantitative deficiency vWF	< 30	< 30	> 0.5 to 0.7	Normal or low
Type 2A	Decreased vWF-dependent platelet adhesion with selective deficiency of high–molecular-weight multimers	< 30	< 30 to 200*	< 0.5 to 0.7	Normal or low
Type 2B	Increased affinity for platelet glycoprotein Ib	< 30	< 30 to 200*	Usually < 0.5 to 0.7	Normal or low
Type 2M	Decreased vWF-dependent platelet adhesion without selective deficiency of high–molecular-weight multimers	< 30	< 30 to 200*	< 0.5 to 0.7	Normal or low
Type 2N	Markedly decreased binding affinity for factor VIII	30 to 200	30 to 200	> 0.5 to 0.7	Very low
Type 3	Virtually complete quantitative deficiency of vWF	< 3	< 3	NA	Extremely low (< 10 IU per dL)
Low vWF	Borderline deficiencies	30 to 50	30 to 50	> 0.5 to 0.7	Normal
Normal	NA	50 to 200	50 to 200	> 0.5 to 0.7	Normal