World Health Organisation(WHO) blood safety guidelines specify that blood donations should be 100% voluntary and unpaid. It also specifies certain guidelines regarding the donors. For donating blood, one :
Should be healthy
Should be of age between 17 years to 65 years
Should weigh at least 50 Kg (110 pounds)
If you have chronic health conditions like asthma, high BP or diabetes, the health will be assessed by the trained personnel to determine your eligibility
Further, you should not have donated within the specific period depending on the type of donation planned:
Whole Blood donation : 3 months
Platelet donation : 1 week
Plasma donation : 1 month
Double Red cell donation: 4 months
You are not eligible to donate blood frequently if you:
Have ever used self-injected drugs (non-prescription).
Have ever had hepatitis B or hepatitis C.
Are in a high-risk group for AIDS.
Are a diabetic on medication.
You are not eligible to donate blood if you:
Are sick (cold, flu, sore throat or diarrhoea).
Have taken antibiotics within the last five days.
Have had dental work within the last three days.
Are anemic (Iron Def. Anaemia).
Have had any ear/body piercings, or have had a tattoo, within the last year.