Diagnosis	Initial tests			Additional tests
	VWF:RCo (IU per dL)*	VWF:Ag (IU per dL)*†	Factor VIII	Ratio of VWF: RCo to VWF:Ag	RIPA	VWF multimers‡
Type 1	< 30	< 30	↓ or normal	> 0.5 to 0.7	Often normal	Normal
Type 2A	< 30	< 30 to 200	↓ or normal	< 0.5 to 0.7	↓	↓ high-molecular-weight multimers
Type 2B	< 30	< 30 to 200	↓ or normal	Usually < 0.5 to 0.7	↑	↓ high-molecular-weight multimers
Type 2M	< 30	< 30 to 200	↓ or normal	< 0.5 to 0.7	↓	Normal
Type 2N	30 to 200	30 to 200	↓ ↓	> 0.5 to 0.7	Normal	Normal
Type 3	< 3	< 3	↓ ↓ ↓ (< 10 IU per dL)	NA	Absent	NA
Low VWF	30 to 50§	30 to 50§	Normal	> 0.5 to 0.7	Normal	Normal
Normal	50 to 200	50 to 200	Normal	> 0.5 to 0.7	Normal	Normal