Good health of the donor must be fully ensured. The universally accepted criteria for donor selection are:

• Age between 18 and 65 years
• Haemoglobin - not less than 12.5g/dL
• Pulse between 50 and 100/minute with no irregularities
• Blood Pressure Systolic 100-180 mm Hg and Diastolic 50 - 100 mm Hg
• Temperature Normal (oral temperature not exceeding 37.5 C)
• Body weight not less than 45 kg.

A healthy person can donate blood in a regular interval of 3 months.