Having a long‑term condition does not automatically mean you can never donate. Many people with well‑controlled chronic illnesses are able to give blood safely.

Important: The final decision is always made by the doctor or trained staff at the blood centre, following national guidelines.

Hypertension (high blood pressure)

You may be allowed to donate if:

·       Your blood pressure is well controlled with lifestyle and/or medication.

·       On the day of donation, your reading is within the acceptable range (for example, below about 180/100 and above about 90/50, though exact numbers vary).

·       You have no serious complications, such as recent heart attack, stroke or severe kidney disease.

You might be deferred if:

·       Your blood pressure is very high or very low at screening.

·       You have chest pain, shortness of breath, or other signs of serious heart trouble.

·       Your doctor has specifically advised against donating.

Diabetes

Many people with diabetes can donate if:

·       Their blood sugar is reasonably well controlled.

·       They do not have serious complications (e.g., active foot ulcers, severe kidney disease, very recent hospitalization).

·       Their doctor agrees that donation is safe for them.

Some blood services have particular rules for insulin‑dependent diabetes, so be sure to mention your exact treatment.

Asthma

·       Mild, well‑controlled asthma is often compatible with donation, especially if you are symptom‑free on the day and using your usual medications.

·       If you are wheezing, recently had a severe asthma attack, or are very breathless, you will probably be asked to wait until stable.

Always bring your inhalers and inform staff about recent attacks or hospitalizations.

Other common conditions

·       Thyroid disease (hypo‑ or hyperthyroidism) that is stable on treatment often does not prevent donation.

·       Mild depression or anxiety usually does not prevent donation as long as you can give informed consent and feel well that day.

·       Mild, explained anemia will defer you until your hemoglobin improves.

When chronic conditions mean “no”

Certain conditions often lead to permanent or long‑term deferral, such as:

·       Serious heart failure or significant heart valve disease.

·       Severe chronic lung disease causing persistent breathlessness.

·       Some cancers and blood disorders.

·       Chronic kidney failure on dialysis.

In these cases, your health and safety take priority. You can still support blood donation by encouraging others and sharing correct information.