Blood type changed during pregnancy

[Anonymous]

I would trust your blood donation center and their testing lab more than your doctor’s office. They’re required to get your blood type right and be meticulous in doing so because they’re responsible for sending out blood bags to be transfused to people in need. If they label a bag of blood incorrectly, a recipient could die or be seriously injured.

[Anonymous]

They were waiting on my daughter’s blood results when she was in the emergency room of our local hospital before they transferred her to another hospital, and I heard the legitimate doctor say to someone else, “Yeah, the RH type is still pending. You can honestly just assume she’s going to be positive because most Hispanics are.” This was in our small town in New Mexico.

Let’s just say that I don’t have high hopes for all doctors. They’re a mixed bag (like every profession). When it comes to your health, never take anything at face value. Always verify.

[Anonymous]

Anonymous wrote:I would trust your blood donation center and their testing lab more than your doctor’s office. They’re required to get your blood type right and be meticulous in doing so because they’re responsible for sending out blood bags to be transfused to people in need. If they label a bag of blood incorrectly, a recipient could die or be seriously injured.

The hospital checks too gor this reason

[Anonymous]

Anonymous wrote:

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Anonymous wrote:

Anonymous wrote:As someone who works in the field, the likeliest explanation is that you mistakenly thought you were B- when you’re actually A-. We get a lot of patients that say they were mistyped. The scenario that usually ends up playing out is that they were incorrect about their blood type. When you have this job, you realize just how faulty the human memory can be.

We get a lot of people who think they’re B (+ or -) when they’re actually O (+ or -) or A (+ or -). We also get a lot who think they’re the universal donor (O-) when they’re actually O+ (the most common blood type). Many can also not accurately remember whether they are + or - even if they know their correct ABO group. These are the most frequent mix-ups for some reason.

I’ve noticed this too. I think it’s just human nature to want to feel special or unique, even when it comes to something like blood type. The amount of people that I’ve seen claiming to be the universal donor is very disproportionate to the percentage of the US population that genuinely is O- (between 7 and 9 percent).

https://my.clevelandclinic.org/health/treatments/21213-blood-types

Maybe I’m selfish, but I’d rather be AB+ than O-. It’s more beneficial to the individual. O- can donate blood to anyone with any blood type, but AB+ can receive blood from anyone with any blood type. Those who are O- can only receive O- blood.

Anyone who is O- and needs a blood transfusion will be straight out of luck if they ever have a severe shortage of O-.

I’d rather be type A than be either of those. I believe studies have come out that identify type A as the blood type with the lowest risk for the majority of illnesses and as the most protective against viruses and infections. This was an area of interest and research during the COVID pandemic. I remember people talking about it. Unfortunately, I’m (along with my DH and kids) stuck with O. That genetic lottery business is brutal.

It might be a coincidence, but every single person that I know of who is type O has some sort of problem with some part of their digestive system/GI tract and experiences digestive symptoms. They usually struggle with spicy or acidic foods and dairy products. It doesn't matter how healthy they otherwise are. This is a common theme.

What data do you have to show this is a "common theme"? I have O type blood, and no GI issues whatsoever, similar to my family members who are also type O. You may need to take a basic statistics and a basic biology class before spreading weird anecdotes.

https://source.washu.edu/2016/08/study-may-explain-people-type-o-blood-likely-die-cholera/

https://academic.oup.com/jid/article-abstract/181/4/1364/856946?redirectedFrom=fulltext

https://link.springer.com/article/10.1007/BF02239355

https://scholar.google.com/scholar_lookup?journal=J%20Virol%20Microbiol&title=Relationship%20between%20ABO%20blood%20groups%20and%20Helicobacter%20pylori%20infection%20among%20patients%20with%20dyspepsia&author=GK%20Baqir&author=A%20Al-sulami&author=SS%20Hamadi&volume=2016&publication_year=2014&pages=1-18&

https://pmc.ncbi.nlm.nih.gov/articles/PMC5472337/

https://www.nature.com/articles/s41598-024-64476-9

https://pmc.ncbi.nlm.nih.gov/articles/PMC5742377/

https://www.longdom.org/open-access/association-between-abo-blood-group-and-clinical-outcomes-in-patients-with-gastrointestinal-bleeding-31410.html

https://pmc.ncbi.nlm.nih.gov/articles/PMC10351991/

Did you bother to read the articles you posted? More severe incidence of cholera in people with type O blood is not the same as saying that all people with type O blood suffer from gastrointestinal issues and can’t eat spicy food.

Did you bother to read the rest of the links (particularly the 3rd one)? https://link.springer.com/article/10.1007/BF02239355

There is NEVER going to be a study that establishes that ALL people with type O blood suffer from gastrointestinal issues, as researchers do not deal in absolutes. I have simply provided evidence that there is a demonstrable link/correlation and potential causation (gastric hyperacidity associated with type O blood).

Additionally, there is a reason that 1st link regarding cholera and a few of the other links were included. I needed to show that a link between blood types and disease/illness susceptibility and severity risk has been established, as the poster that I responded to was trying to discredit that premise entirely. Funnily enough, there are other posters on this thread establishing a link between type A blood and medical conditions, and that poster has not attempted to disprove them.

Unless I somehow didn’t see it you missed mentioning the fact that blood group O is the most susceptible to norovirus (stomach flu), which obviously has an impact on the digestive system. It causes inflammation of the stomach and intestines. (If you have ever had it then you know it’s brutal!!) You’re right that we’re (group O peeps) more prone to digestive problems overall. The other blood groups are more prone to other problems. The evidence is out there. We can’t change our blood group, but we can remain aware.

https://pubmed.ncbi.nlm.nih.gov/32092482/

[Anonymous]

When I was pregnant, they told me that I was A- and needed RhoGAM when my blood type has always been A+. I ended up finding out that I have the weak D variant (which means that I’m genetically Rh positive but my blood can sometimes appear as Rh negative because I have a reduced amount of the D antigen).

I refused RhoGAM before and after birth because it’s completely unnecessary. I’m scientifically Rh positive.

https://www.aabb.org/docs/default-source/default-document-library/positions/statement150722.pdf?sfvrsn=f4f44c30_6

https://nacblood.ca/en/resource/rhd-genotyping-prenatal-patients

[Anonymous]

You need to speak with a hematologist. They specialize in all things blood related.

[Anonymous]

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:I’ve heard of people claiming their blood type changed. I think most are simply cases of people misremembering or not knowing in the first place but thinking they do. My own husband was told by his parents that he was O- but found out that he’s actually O+.

Your blood type doesn’t randomly change. It is genetic. It stays the same throughout your life like your eye color.

Well your eye color definitely changes throughout life and not just from cataracts. Babies often have blueish or violet eye colors that turn hazel. And hazel eyed people’s eye colors change with their mood - if normally brownish they turn amber or green when they get mad or if normally green they turn blue when they get upset.

They can change from a lighter color to a darker color in infants and toddlers because babies do not produce much melanin when they’re first born. That’s why a lot of babies are born with blue eyes that later turn brown (for example). In those babies, it’s not really changing though because their eyes were always going to be brown based on their genetics. Brown is always their actual eye color that their genetics coded for. Once you have your final eye color, it does not truly change (unless you have some sort of medical condition). It’s simply an optical illusion.

That’s why I’ve always thought mothers were weird for asking how they can prevent their baby’s eyes from becoming darker (which I see often on mom forums). If their genes/alleles determine their eyes are going to be brown, then they’re going to be brown. You can’t stop it. The same applies to skin color and hair color.

[Anonymous]

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:I’ve heard of people claiming their blood type changed. I think most are simply cases of people misremembering or not knowing in the first place but thinking they do. My own husband was told by his parents that he was O- but found out that he’s actually O+.

Your blood type doesn’t randomly change. It is genetic. It stays the same throughout your life like your eye color.

Well your eye color definitely changes throughout life and not just from cataracts. Babies often have blueish or violet eye colors that turn hazel. And hazel eyed people’s eye colors change with their mood - if normally brownish they turn amber or green when they get mad or if normally green they turn blue when they get upset.

They can change from a lighter color to a darker color in infants and toddlers because babies do not produce much melanin when they’re first born. That’s why a lot of babies are born with blue eyes that later turn brown (for example). In those babies, it’s not really changing though because their eyes were always going to be brown based on their genetics. Brown is always their actual eye color that their genetics coded for. Once you have your final eye color, it does not truly change (unless you have some sort of medical condition). It’s simply an optical illusion.

That’s why I’ve always thought mothers were weird for asking how they can prevent their baby’s eyes from becoming darker (which I see often on mom forums). If their genes/alleles determine their eyes are going to be brown, then they’re going to be brown. You can’t stop it. The same applies to skin color and hair color.

I’ll never understand the societal obsession with non-brown eyes. I have always loved medium to dark brown eyes (the type that are pure brown with no yellow or green hue or any other color). The darker the brown, the better.

My eyes are hazel (a mix of light brown, green, and yellowish). I’ve never liked the color. I’m just grateful that my eyes function properly, though. The color of them is just a superficial thing.

[Anonymous]

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:I’ve heard of people claiming their blood type changed. I think most are simply cases of people misremembering or not knowing in the first place but thinking they do. My own husband was told by his parents that he was O- but found out that he’s actually O+.

Your blood type doesn’t randomly change. It is genetic. It stays the same throughout your life like your eye color.

Well your eye color definitely changes throughout life and not just from cataracts. Babies often have blueish or violet eye colors that turn hazel. And hazel eyed people’s eye colors change with their mood - if normally brownish they turn amber or green when they get mad or if normally green they turn blue when they get upset.

They can change from a lighter color to a darker color in infants and toddlers because babies do not produce much melanin when they’re first born. That’s why a lot of babies are born with blue eyes that later turn brown (for example). In those babies, it’s not really changing though because their eyes were always going to be brown based on their genetics. Brown is always their actual eye color that their genetics coded for. Once you have your final eye color, it does not truly change (unless you have some sort of medical condition). It’s simply an optical illusion.

That’s why I’ve always thought mothers were weird for asking how they can prevent their baby’s eyes from becoming darker (which I see often on mom forums). If their genes/alleles determine their eyes are going to be brown, then they’re going to be brown. You can’t stop it. The same applies to skin color and hair color.

I’ll never understand the societal obsession with non-brown eyes. I have always loved medium to dark brown eyes (the type that are pure brown with no yellow or green hue or any other color). The darker the brown, the better.

My eyes are hazel (a mix of light brown, green, and yellowish). I’ve never liked the color. I’m just grateful that my eyes function properly, though. The color of them is just a superficial thing.

It’s probably because brown is, by far, the most common eye color worldwide. If blue or green was the most common color, then everyone would obsess over brown eyes. People like what is uncommon. Also, humans in general tend to like and want what we don’t have.

[Anonymous]

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:I’ve heard of people claiming their blood type changed. I think most are simply cases of people misremembering or not knowing in the first place but thinking they do. My own husband was told by his parents that he was O- but found out that he’s actually O+.

Your blood type doesn’t randomly change. It is genetic. It stays the same throughout your life like your eye color.

Well your eye color definitely changes throughout life and not just from cataracts. Babies often have blueish or violet eye colors that turn hazel. And hazel eyed people’s eye colors change with their mood - if normally brownish they turn amber or green when they get mad or if normally green they turn blue when they get upset.

They can change from a lighter color to a darker color in infants and toddlers because babies do not produce much melanin when they’re first born. That’s why a lot of babies are born with blue eyes that later turn brown (for example). In those babies, it’s not really changing though because their eyes were always going to be brown based on their genetics. Brown is always their actual eye color that their genetics coded for. Once you have your final eye color, it does not truly change (unless you have some sort of medical condition). It’s simply an optical illusion.

That’s why I’ve always thought mothers were weird for asking how they can prevent their baby’s eyes from becoming darker (which I see often on mom forums). If their genes/alleles determine their eyes are going to be brown, then they’re going to be brown. You can’t stop it. The same applies to skin color and hair color.

I’ll never understand the societal obsession with non-brown eyes. I have always loved medium to dark brown eyes (the type that are pure brown with no yellow or green hue or any other color). The darker the brown, the better.

My eyes are hazel (a mix of light brown, green, and yellowish). I’ve never liked the color. I’m just grateful that my eyes function properly, though. The color of them is just a superficial thing.

Same here. I like eyes that are so dark brown you can barely see the pupil. 🤎👀

[Anonymous]

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:I’ve heard of people claiming their blood type changed. I think most are simply cases of people misremembering or not knowing in the first place but thinking they do. My own husband was told by his parents that he was O- but found out that he’s actually O+.

Your blood type doesn’t randomly change. It is genetic. It stays the same throughout your life like your eye color.

Well your eye color definitely changes throughout life and not just from cataracts. Babies often have blueish or violet eye colors that turn hazel. And hazel eyed people’s eye colors change with their mood - if normally brownish they turn amber or green when they get mad or if normally green they turn blue when they get upset.

They can change from a lighter color to a darker color in infants and toddlers because babies do not produce much melanin when they’re first born. That’s why a lot of babies are born with blue eyes that later turn brown (for example). In those babies, it’s not really changing though because their eyes were always going to be brown based on their genetics. Brown is always their actual eye color that their genetics coded for. Once you have your final eye color, it does not truly change (unless you have some sort of medical condition). It’s simply an optical illusion.

That’s why I’ve always thought mothers were weird for asking how they can prevent their baby’s eyes from becoming darker (which I see often on mom forums). If their genes/alleles determine their eyes are going to be brown, then they’re going to be brown. You can’t stop it. The same applies to skin color and hair color.

I’ll never understand the societal obsession with non-brown eyes. I have always loved medium to dark brown eyes (the type that are pure brown with no yellow or green hue or any other color). The darker the brown, the better.

My eyes are hazel (a mix of light brown, green, and yellowish). I’ve never liked the color. I’m just grateful that my eyes function properly, though. The color of them is just a superficial thing.

Same here. I like eyes that are so dark brown you can barely see the pupil. 🤎👀

I’m Korean. Like 99% of our people fit this description, haha. It is plain for us. Koreans get excited if a baby is born with light brown eyes.

[Anonymous]

Anonymous wrote:I’m just wondering if anyone else has experienced something similar. I’m pregnant. Before pregnancy, my blood type was B-. I know this for certain because I have been a blood donor for years, and it says B- on my blood donor card and Red Cross app. When I had my blood drawn recently, I was told that I’m A-. My parents (also donors) are type B and type O, so it’s also genetically impossible for me to be type A. My doctor has told me that it’s not possible for your blood type to change if you have never had a blood transfusion or bone marrow transplant. She seemed sure that I’m A-.

It doesn’t really matter in the grand scheme of things, but my curiosity has been peaked. I wonder if pregnancy can cause something like this and if it will be temporary or permanent.

Beyond stupid. Your blood type is the same for life!

[Anonymous]

Anonymous wrote:

Anonymous wrote:I’m just wondering if anyone else has experienced something similar. I’m pregnant. Before pregnancy, my blood type was B-. I know this for certain because I have been a blood donor for years, and it says B- on my blood donor card and Red Cross app. When I had my blood drawn recently, I was told that I’m A-. My parents (also donors) are type B and type O, so it’s also genetically impossible for me to be type A. My doctor has told me that it’s not possible for your blood type to change if you have never had a blood transfusion or bone marrow transplant. She seemed sure that I’m A-.

It doesn’t really matter in the grand scheme of things, but my curiosity has been peaked. I wonder if pregnancy can cause something like this and if it will be temporary or permanent.

Beyond stupid. Your blood type is the same for life!

Please explain this then (link below). It would be awful strange for blood type results to be inaccurate that many times. The antigen testing that they use is highly sensitive and accurate, and multiple human errors are also usually caught.

https://www.tiktok.com/t/ZP8xfkSoR/

[Anonymous]

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:I’m just wondering if anyone else has experienced something similar. I’m pregnant. Before pregnancy, my blood type was B-. I know this for certain because I have been a blood donor for years, and it says B- on my blood donor card and Red Cross app. When I had my blood drawn recently, I was told that I’m A-. My parents (also donors) are type B and type O, so it’s also genetically impossible for me to be type A. My doctor has told me that it’s not possible for your blood type to change if you have never had a blood transfusion or bone marrow transplant. She seemed sure that I’m A-.

It doesn’t really matter in the grand scheme of things, but my curiosity has been peaked. I wonder if pregnancy can cause something like this and if it will be temporary or permanent.

Beyond stupid. Your blood type is the same for life!

Please explain this then (link below). It would be awful strange for blood type results to be inaccurate that many times. The antigen testing that they use is highly sensitive and accurate, and multiple human errors are also usually caught.

https://www.tiktok.com/t/ZP8xfkSoR/

I have had 7 blood transfusions and my blood type has remained the same.

[Anonymous]

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:I’m just wondering if anyone else has experienced something similar. I’m pregnant. Before pregnancy, my blood type was B-. I know this for certain because I have been a blood donor for years, and it says B- on my blood donor card and Red Cross app. When I had my blood drawn recently, I was told that I’m A-. My parents (also donors) are type B and type O, so it’s also genetically impossible for me to be type A. My doctor has told me that it’s not possible for your blood type to change if you have never had a blood transfusion or bone marrow transplant. She seemed sure that I’m A-.

It doesn’t really matter in the grand scheme of things, but my curiosity has been peaked. I wonder if pregnancy can cause something like this and if it will be temporary or permanent.

Beyond stupid. Your blood type is the same for life!

Please explain this then (link below). It would be awful strange for blood type results to be inaccurate that many times. The antigen testing that they use is highly sensitive and accurate, and multiple human errors are also usually caught.

https://www.tiktok.com/t/ZP8xfkSoR/

I have had 7 blood transfusions and my blood type has remained the same.

I had a blood transfusion in June of 2025. My blood type “changed” from AB+ to O+ (which is the type that I was transfused with). I was told that any change would be temporary, but my blood is still testing as O+ almost a year later (as of the beginning of February).