Learn Your Blood Type Information With MyChart

Understanding Your Blood Type and Why It Matters

Your blood type is one of the most important pieces of medical information about your body. It describes the specific proteins and antigens present on the surface of your red blood cells. There are four main blood types: A, B, AB, and O. Each type can also be either positive or negative, depending on whether you have a protein called the RhD antigen. This means there are eight possible blood type combinations that most people have.

Get Your Free Guide to SSDI and Stimulus Checks →

Knowing your blood type matters for several practical reasons. If you ever need a blood transfusion during surgery or after an accident, doctors must know your blood type to give you compatible blood. Receiving the wrong blood type can cause serious medical complications. Additionally, certain blood types are associated with slightly different health considerations. For example, some research suggests that people with type O blood may have a lower risk of certain blood clots, while people with type AB blood may have different cholesterol patterns.

Pregnant women also benefit from knowing their blood type. If a pregnant person has RhD negative blood and their baby has RhD positive blood, doctors can provide treatment to prevent complications in future pregnancies. New parents often learn their baby's blood type through newborn screening tests.

Many people discover their blood type by chance during medical appointments, blood donation events, or when their parents mention it. However, MyChart offers a way to view this information directly if it has been recorded in your medical records. Your primary care doctor's office typically tests your blood type during routine physical exams or before any surgical procedure.

Practical Takeaway: Blood type knowledge is essential medical information. Check whether your doctor's office has recorded your blood type, and keep this information in a safe place for emergency situations.

How to Find Your Blood Type Through MyChart

MyChart is an online patient portal provided by many healthcare systems that allows you to view portions of your medical records from home. If your doctor's office uses MyChart, you can often find your blood type listed in several locations within the portal. The most common place to find blood type information is in the laboratory results section, where past blood work is organized by date.

Learn How CSL Plasma Payment Works for Donors →

To locate your blood type in MyChart, log into your account using your username and password. Once logged in, look for a section labeled "Results," "Lab Results," "Test Results," or "Medical Records." These sections vary slightly depending on your healthcare system. When you enter the results area, you should see a list of all tests you have had performed. Blood type tests are sometimes labeled as "ABO Blood Type," "Blood Type and RhD," or simply "Type and Screen."

Click on the test result to view your blood type. The result will show your ABO type (A, B, AB, or O) and your RhD status (positive or negative). Some MyChart systems also show additional information about when the test was performed and which doctor ordered it. If your blood type has been tested multiple times, all results should appear in chronological order, with the most recent test typically listed first.

If you cannot find your blood type in MyChart, it may mean that your doctor's office has not yet entered this information into the portal, or your blood type has never been formally tested and recorded. This is not unusual, as blood type testing is only performed when medically necessary. In this case, you can contact your doctor's office directly and request that they perform a blood type test or look up your blood type if it has been tested elsewhere.

Practical Takeaway: Use the lab results or medical records section of MyChart to search for your blood type test results, organized by date from most recent backward.

Interpreting Your Blood Type Results and What Each Type Means

Once you locate your blood type in MyChart, it will appear as a combination of letters and a plus or minus sign. For example, you might see "O+", "A-", "B+", or "AB-". Understanding what these letters and symbols mean helps you interpret your results correctly.

Get Your Free Peanut Island Park Fishing Guide →

The first part of your blood type is your ABO group. Type A blood means your red blood cells have A antigens on their surface. Type B blood has B antigens. Type AB blood has both A and B antigens, making it the rarest type, found in only about 4% of the U.S. population. Type O blood has neither A nor B antigens, making it the most common type, present in roughly 46% of Americans. The plus or minus sign that follows refers to your RhD factor. A positive sign means you have the RhD protein, while a negative sign means you do not.

Blood type distribution varies by ancestry and geographic background. Type O is most common overall, but type B is more common in Asian populations. Type AB is the rarest in all populations. About 85% of people are RhD positive, while 15% are RhD negative. This is important information because people with rare blood types may have harder times finding compatible blood if they need a transfusion.

Your blood type is determined by genetics inherited from both parents. It does not change throughout your life under normal circumstances. However, in extremely rare cases involving bone marrow transplants or certain blood disorders, a person's blood type can change. Your blood type does not indicate anything about your character, intelligence, personality, or worth as a person, despite pseudoscientific claims made by some blood type diet promoters.

Practical Takeaway: Your blood type result shows your ABO type (A, B, AB, or O) and RhD factor (+ or -), determined by genetics and constant throughout your life.

Blood Type Information for Medical Emergencies and Everyday Safety

Knowing your blood type can be lifesaving information during medical emergencies. If you are severely injured in a car accident, suffer a major injury requiring immediate surgery, or face any medical situation where blood loss is significant, emergency room doctors need to know your blood type quickly to provide compatible blood for transfusion. In emergency situations, there may not be time to test your blood type, so having this information available is critical.

How to Clean Paint Brushes the Right Way →

You can make your blood type information readily available through several practical methods. Write it on an emergency contact card that you keep in your wallet. Include it in your phone's emergency contact information, which can be accessed by first responders without unlocking your phone. Tell close family members, roommates, and people you see regularly about your blood type. Consider wearing medical alert jewelry such as a bracelet or necklace if you have rare blood type complications or other serious medical conditions.

If you donate blood, the blood bank will test your blood type and provide you with a donor card listing your type. This card serves as portable proof of your blood type and can be given to doctors if needed. Many people keep their blood donor cards in their wallets for this reason, even if they no longer donate regularly.

Additionally, if you are planning surgery, always mention your blood type to your surgical team before the procedure. This allows them to have compatible blood readily available if complications arise. If you are pregnant or planning to become pregnant, your blood type becomes especially important. If you are RhD negative and carrying an RhD positive baby, you may receive an injection called RhoGAM to prevent complications in current and future pregnancies.

Practical Takeaway: Store your blood type information in your wallet, phone emergency contacts, and share it with family members so it is available during medical emergencies.

Blood Type and Specific Health Considerations

While blood type does not determine overall health or predict serious disease, medical research has identified some statistical associations between blood type and certain health conditions. Understanding these associations may provide context for conversations with your doctor, though they should never be used for self-diagnosis or as a reason to be concerned about conditions you do not have.

TANF Application Guide →

Type O blood appears to be associated with a slightly lower risk of blood clots, which is why type O individuals are frequently sought as blood donors. However, some research suggests type O blood may be associated with slightly higher rates of stomach ulcers caused by H. pylori bacteria. Type A blood has been associated in some studies with slightly higher risks of blood clots and heart disease, though many other factors like diet, exercise, and family history matter far more. Type AB blood, the rarest, has been associated with slightly higher blood pressure and cardiovascular disease risk in some studies. Type B blood has shown associations with higher average cholesterol levels in some populations.

These associations are small statistical trends identified through large population studies. They do not mean that someone with a particular blood type will definitely develop these conditions, nor