Table 1 Results of assessment of normal and abnormal samples by the first observer.

Nature of sample	Number of samples	Definitely positive	Equivocal	Negative
A+E	18	17	1	0
A+S	1	0	0	1
A+C	6	0	0	6
A+D	4	0	0	4
S+C	3	0	2	1
S+F	4	0	1	3
β Thalassaemia trait	3	0	0	3
Normal	17	0	0	17