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Doctor insights on: Rh Factor Negative

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Dr. Scott Keith
2 doctors shared insights

Rh Factor Negative (Overview)

Negative means a person does not have the Rh factor (D antigen or Rhesus factor) on her red blood cells. The presence or absence of the Rh factor is important in blood transfusions and in pregnancies.


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Blood test says my blood type is O Positive but on the part where is says Rh factor it says negative. How does that make sense? Mean something else?

Blood test says my blood type is O Positive but on the part where is says Rh factor it says negative. How does that make sense? Mean something else?

It doesn't: It doesn't really, but here's what probably happened: If you're pregnant and getting prenatal labs, in RH negative patients who've had a previous pregnancy it's typical to test for RH factor antibody (an immune response against RH+ blood). This test is not necessary in RH+ women, but it was likely done by routine, and the result, as expected in negative since an RH+ person won't have RH Antibody ...Read more

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Dr. Scott Keith
2 doctors shared insights

Rh Factor Negative (Overview)

Negative means a person does not have the Rh factor (D antigen or Rhesus factor) on her red blood cells. The presence or absence of the Rh factor is important in blood transfusions and in pregnancies.


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Is there any importance to my having a negative Rh factor and being pregnant?

Is there any importance to my having a negative Rh factor and being pregnant?

Only if the father: of the baby is Rh positive. If it is your first pregnancy with this man, (miscarriages count as pregnancies) then there is no immediate issue. If he is Rh negative, there is no issue. After that consult your OB. ...Read more

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If I am pregnant and have a negative Rh factor and my child has a positive factor. What does it mean for us?

If I am pregnant and have a negative Rh factor and my child has a positive factor. What does it mean for us?

RhoGAM: You'll need injections of rh-immune-globulin (rhogam) at one or possibly more scheduled times in the pregnancy. It's been a standard part of prenatal care for many years, ask your OB doctor when you see him/her. ...Read more

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Do all negative blood types automatically have a negative Rh factor? (if you neg on one are u neg on other)

Do all negative blood types automatically have a negative Rh factor? (if you neg on one are u neg on other)

It's the same thing: In the abo/rh blood typing categories, if the rh factor is not there, it is called a negative blood type. (in other situations, when doctors are not talking about the abo/rh typing, then "negative" would mean that something else is missing. For example, a test for sickle cell anemia would be called "negative" if no sickle cell mutation was found, but would not be talking about the rh factor.). ...Read more

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I have cyst nd my gyni says that i have negative rh factor and my husband has positive rh factor so does this rh factor effects on conceiving?

I have cyst nd my gyni says that i have negative rh factor and my husband has positive rh factor so does this rh factor effects on conceiving?

No: Rh factor does not affect conception, but it may have an effect on the fetus if the fetus is Rh positive and you make antibodies to Rh. Please keep in touch with your doctor, as there are ways of preventing you from making antibodies to Rh. Visit this site for more info: http://www.pregnancy.org/article/rh-incompatibility-and-why-you-need-rhogam ...Read more

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Can someone have o positive blood with a Rh negative factor if they had a lot of transfusions?

Can someone have o positive blood with a Rh negative factor if they had a lot of transfusions?

No.: O + means type 0, rh positive blood type. It is possible to give rh negative blood to an rh positive recipient, but not the other way around. Your blood doesn't change with transfusion (it's genetic). A person's blood type can change after bone marrow transplant from someone of a different blood type however. ...Read more

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Does the baby get anemic if it is neg or pos with the Rh factor?

Does the baby get anemic if it is neg or pos with the Rh factor?

Neither: Today's newborns rarely if ever have a Rh factor issue do to progress in managing the issue during pregnancy. ( I haven't seen it in 40 yrs)There are some that may become anemic after birth due to ABO profile conflicts, where the mom has sent antibodies across the placenta that break attack the babies red cells. ...Read more

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If my husband and I have an Rh factor issue (he has a+ blood and mine is o neg), can we still have a baby?

If my husband and I have an Rh factor issue (he has a+ blood and mine is o neg), can we still have a baby?

Yes: You can get an injection of Rhogam at @ 28weeks and after birth if the baby is rH +. This is a common occurance and you can discuss it with your OB.I had the same thing and got Rhogam with both of my pregnacies. ...Read more

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If you don't know the babys father, how do you check the Rh factor of the baby when you are Rh negative?

If you don't know the babys father, how do you check the Rh factor of the baby when you are Rh negative?

After delivery: The baby's blood type will be determined shortly after birth. You will receive a Rhogam injection around 28 weeks of pregnancy. If the baby is rh positive, you will receive another dose before you leave the hospital. If the baby is rh negative, nothing further needs to be done. ...Read more

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I'm 29 weeks pregnant w/ my 3rd and have the RH factor. At 28 weeks blood was drawn and they said it showed negative antibodies, what does that mean?

I'm 29 weeks pregnant w/ my 3rd and have the RH factor. At 28 weeks blood was drawn and they said it showed negative antibodies, what does that mean?

Its Good: Rh is your blood type. The absence of antibodies means you are healthy. For more details see: http://www.acog.org/~/media/For%20Patients/faq027.pdf?dmc=1&ts=20140819T0934564428 Best wishes with your pregnancy and soon to be new born child ! ...Read more

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Had miscarriage at 6w3d. On 4/2/13. Have a neg. Blood. Er/urgent care docs did not give rhogam shot. Is it needed? Not sure of hubby's Rh factor.

Had miscarriage at 6w3d. On 4/2/13. Have a neg. Blood. Er/urgent care docs did not give rhogam shot. Is it needed? Not sure of hubby's Rh factor.

You need it soon: 85% of people have rh+ blood, so playing the laws of averages, there is a very strong likelihood that the father was rh+. There is always the chance that the baby would have been rh- and Rhogam wouldn't be necessary, but why take the chance. It's to prevent a problem with future pregnancies. ...Read more

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ANA 1:160 homogenous, anti ssDNA 42, normal Rh factor, ESR, anti dsDNA , neg HLA B27. Tests due to severe joint pain- is this indicative of lupus??

ANA 1:160 homogenous, anti ssDNA 42, normal Rh factor, ESR, anti dsDNA , neg HLA B27. Tests due to severe joint pain- is this indicative of lupus??

Might be.: These labs do not rule lupus out nor do they rule it in. I think your doc should keep looking and monitor your progress over time. Depending upon joints could represent parvovirus although that is just a wild guess. Your clinical picture and progress is most important. ...Read more

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Where Rh factor is present exactly?

blood cells: This is a protein, inherited, which is one the surface of red blood cells it is an important component of blood typing and must be matched for donation to prevent reactions. ...Read more

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What is the definition or description of: Rh factor?

What is the definition or description of: Rh factor?

See answer details.: The commonly used terms rh factor, rh positive and rh negative refer to the d antigen of the rh blood group system. In addition to its role in blood transfusion, the rh blood group system—specifically, the d antigen—is used to determine the risk of hemolytic disease of the newborn (hdn). Hdn sometimes occurs when an rh negative mother has an anti-d antibody and gives birth to an rh positive child. ...Read more

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Could you tell me, in the simplist terms possible, what an Rh factor is?

How simple?: Genetic. You have it or lack it from conception. If you lack it, you can become allergic to it by transfusion or being pregnant with a baby who has it. If you are allergic and Baby has it, Baby can get very sick because of it. This used to be very common and serious but now we can prevent it. This is overly simple but will help you get started. ...Read more

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Baby is Rh factor positive. Is that good?

Baby is Rh factor positive. Is that good?

Only if you are Rh+: Rh positive mothers having rh+ babies-no problem! rh negative mothers with a rh+ baby especially the first and subsequent pregnancies will require Rhogam injection post delivery to prevent future rh disease issues and baby losses. ...Read more

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What can cause my blood Rh factor to change?

What can cause my blood Rh factor to change?

Genetic marker: Rh factor markers are inherited and do not change during a person's life, except in people who get bone marrow transplants. ...Read more

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Is rheumatoid facotr different from Rh factor?

Is rheumatoid facotr different from Rh factor?

Rh Factor: Rheumatoid factor is very different from rh, or rhesus factor. Rf represents an autoimmune process, where your body is attacking itself. Rh is the "d" antigen, which makes our blood cells either positive or negative, such as o+ or o-. If it is present on our red blood cells, we do not make antibodies against it, otherwise we would attack our own blood. But if it is neg, then we do make them. ...Read more

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What is Rh factor and when it happens.Do babies die?

What is Rh factor and when it happens.Do babies die?

Rh disease : Rh disease is a rare blood reaction that occurs when the mother's body develops immune factors that fight the baby's blood. It occurs when the mother is sensitized during a previous pregnancy. ...Read more

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Rh Factor (Definition)

The commonly used terms rh factor, rh positive and rh negative refer to the d antigen of the rh blood group system. In addition to its role in blood transfusion, the rh blood group system—specifically, the d antigen—is used to determine the risk of hemolytic disease of the newborn (hdn). Hdn sometimes occurs when an rh negative mother has an anti-d antibody and gives birth to ...Read more