Conventional Rapid Latex Agglutination in Estimation of von Willebrand Factor: Method Revisited and Potential Clinical Applications

Table 3

Linearity study on semiquantitative VWF antigen by latex agglutination test.

Tube number	Sample 1		Sample 2
	VWF : Ag (%)^a	VWF : Ag (titre)^b	VWF : Ag (%)^a	VWF : Ag (titre)^b
1	600	1 : 128	460	1 : 64
2	300	1 : 64	230	1 : 32
3	150	1 : 32	115	1 : 16
4	86.9	1 : 16	57.9	1 : 8
5	22.2	1 : 8	27.9	1 : 4
6	9.9	1 : 4	17.6	1 : 2

 ^aVWF : Ag levels (%) measured by immunoturbidimetric assay using Hemosil von Willebrand Factor Antigen kit from Instrumentation Laboratory, Italy.
^bVWF : Ag (titre) estimated by using semiquantitative latex agglutination test.
VWF: von Willebrand factor; VWF : Ag: von Willebrand factor antigen.