What Happens if a Blood Test Is Positive? (For Donors)
Many donors wonder: “What if my blood tests show something wrong?” It is natural to feel worried, but the process is designed to handle this confidentially and supportively.
First step: The unit is not used
If any screening test on your donated blood is positive or reactive for a serious infection such as:
· HIV.
· Hepatitis B.
· Hepatitis C.
· Syphilis.
· Or another infection being tested locally,
then:
· That blood unit is discarded and will not be given to any patient.
· This is done even if the result might later turn out to be a false positive (a test that looks positive but is not confirmed on further testing).
The priority is always patient safety.
Because screening tests are very sensitive, they may sometimes react even when someone is not truly infected. To be sure:
· The laboratory may perform confirmatory tests on the same sample (using more specific methods).
· In some systems, you may be asked to come back for a repeat blood test and counselling.
Only after confirmatory testing can a final conclusion be made.
Policies differ from place to place, but typically:
· If a significant infection is suspected or confirmed, the blood centre will contact you privately—by phone, letter or through a clinic appointment.
· You will be offered counselling, where a trained professional explains the result, what it means, and what the next steps are.
· You may be referred to a specialist clinic or doctor for treatment and follow‑up.
Your result is confidential. It is not shared with employers, friends, or family without your permission (except where specific laws require certain notifications, which is rare and usually anonymized).
If a serious infection is confirmed (for example, HIV or chronic hepatitis B/C):
· You will usually be permanently deferred from future blood donation.
· This protects patients and is not a judgment on you as a person.
If the initial test turns out to be false positive or the infection clears, rules about future donation vary. The blood centre’s medical team will advise you based on national guidelines.
Receiving unexpected news about an infection can be very stressful. It helps to know:
· Early detection can be good for your own health, because you can start treatment sooner.
· Many infections are now treatable or manageable, allowing people to live long and productive lives.
· Counsellors and doctors are there to help, not to blame or shame you.