SCD Terms - The Global Initiative for Sickle Cell Anemia - GISA

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SCD Terms

Preparing and Distributing Substantive Educational Materials, Written and Visual, and to Conduct Seminars and Workshops about the Sickle Cell Disease among Variant Groups of Society


Anemia (uh-NEE-me-uh) is a condition in which your blood has a lower than normal number of red blood cells. Anemia also can occur if your red blood cells don’t contain enough hemoglobin (HEE-muh-glow-bin). Hemoglobin is an iron-rich protein that gives blood its red color. This protein helps red blood cells carry oxygen from the lungs to the rest of the body. If you have anemia, your body doesn’t get enough oxygen-rich blood. As a result, you may feel tired or weak. You also may have other symptoms, such as shortness of breath, dizziness, or headaches. Severe or long-lasting anemia can damage your heart, brain, and other organs in your body. Very severe anemia may even cause death.


Blood is made up of many parts, including red blood cells, white blood cells, platelets (PLATE-lets), and plasma (the uid portion of blood). Red blood cells are disc-shaped and look like doughnuts without holes in the center. They carry oxygen and remove carbon dioxide (a waste product) from your body. These cells are made in the bone marrow—a sponge-like tissue inside the bones.

White blood cells and platelets (PLATE-lets) also are made in the bone marrow. White blood cells help ght infection. Platelets stick together to seal small cuts or breaks on the blood vessel walls and stop bleeding. With some types of anemia, you may have low numbers of all three types of blood cells.

Anemia has three main causes: blood loss, lack of red blood cell production, or high rates of red blood cell destruction. These causes might be the result of diseases, conditions, or other factors such as a hereditary disease.


Many types of anemia can be mild, short term, and easily treated. You can even prevent some types with a healthy diet. Other types can be treated with dietary supplements.

However, certain types of anemia can be severe, long lasting, and even life threatening if not diagnosed and treated. If you have signs or symptoms of anemia, see your doctor to nd out whether you have the condition. Treatment will depend on the cause of the anemia and how severe it is.
Global Initiative for Sickle Cell Anemia
Global Initiatiative for Sickle Cell Anemia
Global Initiative for Sickle Cell Anemia


In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.

Chromosomes are not visible in the cell’s nucleus—not even under a microscope—when the cell is not dividing. However, the DNA that makes up chromosomes becomes more tightly packed during cell division and is then visible under a microscope. Most of what researchers know about chromosomes was learned by observing chromosomes during cell division.

Each chromosome has a constriction point called the centromere, which divides the chromosome into two sections, or “arms.” The short arm of the chromosome is labeled the “p arm.” The long arm of the chromosome is labeled the “q arm.” The location of the centromere on each chromosome gives the chromosome its characteristic shape, and can be used to help describe the location of specic genes.

Fetal Hemoglobin (Hgb.F)

A kind of hemoglobin usually present during fetal (intrauterine) life, which has a different chemical structure from normal adult hemoglobin. After birth, the fetal hemoglobin in the red blood cells is gradually replaced by the adult type of hemoglobin, this process is usually complete during the rst 6 months of life.


A Gene is the ultimate unit of inheritance, and is carried by the chromosome. Genes determine our various characteristics such as hair texture, skin color, height, shape of nose, lips, etc., including the kind of hemoglobin in the red blood cells. Genes, which are made up of DNA, act as instructions to make molecules called proteins. In humans, genes vary in size from a few hundred DNA bases to more than 2 million bases. The Human Genome Project has estimated that humans have between 20,000 and 25,000 genes.

Genetic Counseling

In genetic counseling, specially-trained professionals help people learn about genetic conditions, find out their chances of being affected by or having a child or other family member with a genetic condition, and make informed decisions about testing and treatment. This communication process between health care provider and client, emphasizes providing accurate and up-to-date information about a genetic disorder in a sensitive and supportive, non-directive manner.

Genetic Mutation

Genetic mutation is a permanent alteration in the DNA (a change in hereditary characteristics due to a permanent change in a gene) sequence that makes up a gene, such that the sequence differs from what is found in most people. Mutations range in size; they can affect anywhere from a single DNA building block (base pair) to a large segment of a chromosome that includes multiple genes.


The chemical substance (an iron containing protein) of the red blood cell which carries oxygen to the tissues, and gives the cell its red color.

Hemoglobin Electrophoresis

A laboratory technique to determine the type of hemoglobin the individual has. When you pass an electric charge through a solution of hemoglobin, distinct hemoglobins move different distances, depending on their composition. This technique differentiates between usual hemoglobin (A), sickle hemoglobin (S) and many other different kinds of hemoglobin (such as C, D, E, etc.).


To receive certain dened characteristics from a parent by transmission of the genes in the egg and sperm.

Red Blood Cell

Red blood cells play an important role in your health by carrying fresh oxygen throughout the body. Red blood cells are round with a attish, indented center, like doughnuts without a hole. These cell, which contain hemoglobin, circulate throughout the body. Your healthcare provider can check on the size, shape, and health of your red blood cells using tests, such as the complete blood count screening.

Sickle Cell Anemia

An inherited disorder of the red blood cells in which the hemoglobin (the red oxygen carrying pigment of the cell) is different from the usual type. This unusual hemoglobin results in the production of unusually shaped cells, which do not survive the usual length of time in the blood circulation. Thus, anemia results. Sickle cell anemia is the result of the inheritance of the gene for sickle hemoglobin (S) from both parents.

Sickle Cell Disease

The term sickle cell disease (SCD) describes a group of inherited red blood cell disorders. People with SCD have abnormal hemoglobin, called hemoglobin S or sickle hemoglobin, in their red blood cells. People who have SCD inherit two abnormal hemoglobin genes, one from each parent. In all forms of SCD, at least one of the two abnormal genes causes a person’s body to make hemoglobin S. When a person has two hemoglobin S genes, Hemoglobin SS, the disease is called sickle cell anemia. This is the most common and often most severe kind of SCD. Other forms of Sickle Cell Disease include SC, CC, S Beta Zero thalassemia, S Beta+ thalassemia, SD, and SE.

Sickle Cell Trait

The inheritance of one gene for the usual hemoglobin (A) and one gene for sickle hemoglobin (S). A person who has sickle cell trait (AS) is a carrier of the sickle gene, does not have the disease, does not have painful episodes, and is generally not affected by the sickle hemoglobin.

Thalassemia (Thal)

An inherited disorder of a gene in the red blood cells which results in the impaired ability to produce hemoglobin.

Unusual Hemoglobins

In 1989, there where 489 unusual hemoglobins identied. The unusual hemoglobins most commonly seen (frequency in population greater than 1%) are hemoglobins: S (sickle), C, Thal, E, and D (Punjab).
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The Global Initiative for Sickle Cell Anemia
Global Initiative for Sickle Cell Anemia Parliament Legislature Fund
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