The finger prick (FP) i.e. capillary blood samples were obtained from 3 mm deep pricks on the index or middle finger using a dry sterile cancet (Unilet superlite) and Autolet II devices.
The first drop of blood was wiped off and FP was repeated if blood did not flow freely.
The CuSO4 test was performed with CuSO4 solution of specific gravity of 1.053.
After each Hb test the donor was classified as passing or failing the Hb screening based on the behaviour of the sample in CuSO4 solution.