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  • Writer's pictureDr. Karuturi Subrahmanyam

Can Diabetics Donate Blood?

Donating blood is a generous and life-saving act that can benefit many people in need. But if you have diabetes, you may wonder if you can donate blood safely and without affecting your health. The good news is that most people with diabetes can donate blood, as long as they meet certain criteria and follow some precautions.

Who Can Donate Blood With Diabetes?

According to the U.S. Food and Drug Administration (FDA), a person with typical levels of hemoglobin can donate blood. Hemoglobin is a protein in red blood cells that carries oxygen throughout the body. People with diabetes who can control their blood sugar levels with suitable treatments, such as insulin injections or oral medications, are eligible to donate. This is true whether you have type 1 diabetes or type 2 diabetes.

However, other countries may have different standards regarding blood donation for diabetes. For example, in the U.K., people with diabetes who take insulin are not allowed to donate blood. Therefore, it is important to check the local regulations before donating blood in another country.

In addition to having well-managed diabetes, you also need to meet other requirements for donating blood, such as:

  • Being in otherwise good health and free from symptoms of sickness, such as a cold or the flu

  • Being over the age of 17 years in most states (age requirements may vary by state)

  • Weighing at least 50Kgs.

  • Having healthy iron levels (people with iron-deficiency anemia cannot donate blood)

  • Waiting at least 56 days between each blood donation (your doctor may recommend waiting longer if you have diabetes)

  • Having no history of using bovine insulin (insulin derived from beef, which is rare in the U.S.)

  • Having no recent travel to a malaria-risk country

How to Prepare and Recover From Donating Blood With Diabetes

If you meet the eligibility criteria and decide to donate blood, there are some steps you can take to prepare and recover from the donation process.

Before donating blood, you should:

  • Eat a balanced meal that includes carbohydrates, protein, and healthy fats

  • Drink plenty of water or non-alcoholic fluids to stay hydrated

  • Check your blood sugar levels and make sure they are within your target range

  • Bring your diabetes medications and supplies with you to the donation center

  • Inform the staff that you have diabetes and what medications you take

During the donation, you should:

  • Relax and breathe normally

  • Squeeze a stress ball or your hand to keep the blood flowing

  • Alert the staff if you feel dizzy, nauseous, or unwell

After donating blood, you should:

  • Rest for at least 15 minutes and have some juice or snacks provided by the center

  • Drink more fluids throughout the day to replenish your blood volume

  • Avoid strenuous exercise or heavy lifting for at least 24 hours

  • Check your blood sugar levels more frequently than usual and adjust your medications if needed

  • Watch for signs of low blood sugar (hypoglycemia), such as sweating, shaking, hunger, confusion, or weakness

  • Seek medical attention if you experience any complications, such as bleeding, bruising, infection, or allergic reaction

Benefits and Risks of Donating Blood With Diabetes

Donating blood can have some benefits and risks for people with diabetes. Some of the benefits include:

  • Helping others in need of blood transfusions

  • Reducing excess iron levels in the body (high iron levels can increase the risk of heart disease and diabetes complications)

  • Feeling good about yourself and your contribution to society

Some of the risks include:

  • Lowering your blood sugar levels temporarily (this can be prevented by eating before and after donating and monitoring your glucose levels closely)

  • Affecting your hemoglobin A1c (HbA1c) levels for up to two months after donating (HbA1c is a measure of your average blood sugar levels over three months; donating blood may lower your HbA1c temporarily but not reflect your true diabetes control)

  • Experiencing side effects such as fatigue, dizziness, headache, or bruising (these are usually mild and short-lived)


People with diabetes can donate blood safely if they have well-controlled diabetes and meet other eligibility criteria. Donating blood can be a rewarding and altruistic act that can save lives. However, it is important to prepare properly and follow some precautions before and after donating blood to avoid any adverse effects on your health. If you have any questions or concerns about donating blood with diabetes, talk to your doctor or the staff at the donation center.

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