While having O negative blood makes you a universal blood donor, it also means that if you need blood, you can only be transfused with O negative blood. Not only will you help save lives, but you’ll also ensure there’s a good supply of O negative available should you need blood. If you have O negative blood and are able to donate, we encourage you to do so. What does this mean for those with O negative blood? O negative blood may not be the rarest blood type, but may be critical to a victim’s survival in an emergency. When trauma victims need urgent treatment, there is seldom time to test their blood type, so O negative blood is used. In addition, emergency services, including ambulances and helicopters, may also carry it to keep patients alive while they’re being transported to a hospital. Hospitals need to have it on hand for emergencies. O negative blood is valuable because it can be transfused to anyone, regardless of their blood type. If O negative isn’t that rare, why do blood centers and hospitals always need it? Fewer than 50 people in the entire world population are known to have Rh-null blood. However, the rarest blood type in the world is Rh-null, which is so rare most of us have never heard of it. Is that rare? Only about 1 in 67 have B negative blood, making it rarer. Or to put it another way, about 1 in 15 people have O negative blood. If you have 0 negative blood, you have something in common with about 7 percent of the US population. This can affect the newborn baby, who may need treatment after birth.People with O negative blood often wonder how rare their blood is since it is always in demand by hospitals and blood centers. Sometimes an incompatibility may happen when the mother is blood type O and the baby is either A or B. This will prevent being sensitized if the baby is Rh positive. If the mother hasn't already been sensitized to Rh positive blood, they may be given Rh immunoglobulin (RhIg). Problems with the Rh factor happen when the mother's Rh factor is negative and the baby's is positive. If the father's genes are -, and the mother's are -, the baby will be: If the father's genes are -, and the mother's are + -, the baby can be If the father's genes are + - Rh-positive, and the mother's are + - Rh-positive, the baby can be: If a father's Rh factor genes are + +, and the mother's are -, the baby will have one + from the father and one - gene from the mother. If a father's Rh factor genes are + +, and the mother's are + +, the baby will have one + from the father and one + gene from the mother. More specifically, consider the following: If a person has the genes -, the Rh factor will be negative.Ī baby receives one gene from the father and one from the mother. If a person has the genes + -, the Rh factor will also be positive. If a person has the genes + +, the Rh factor in the blood will be positive. The Rh-positive gene is dominant (stronger) and, even when paired with an Rh-negative gene, the positive gene takes over: Rh factors follow a common pattern of genetic inheritance. A baby may have the blood type and Rh factor of either parent or a combination of both parents. The following are the possible combinations of blood types with the Rh factors: If there is no Rh factor protein, the person is Rh- negative. If the Rh factor protein is on the cells, the person is Rh-positive. The Rh factor is a protein that is found on the covering of the red blood cells. The blood type is found as proteins on red blood cells and in body fluids. The blood type and the Rh factor simply mean that a person's blood has certain specific features. Every person has a blood type (O, A, B, or AB) and an Rh factor, either positive or negative.
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