Sickle cell disease prognosis: Life expectancy and outlook
Fact-checked by Sickle cell disease (SCD) prognosis varies depending on disease severity and other factors, but the overall life expectancy for the inherited blood disorder has increased notably over recent decades.
Genetic mutations cause SCD by altering the structure of hemoglobin, the protein that helps transport oxygen throughout the body. This causes red blood cells to become misshapen and take on a sickle-like shape. These sickled cells tend to die prematurely and are prone to becoming trapped in blood vessels, thereby restricting blood flow and oxygen delivery to body tissues. This, in turn, can lead to a series of symptoms and complications, including episodes of sudden, severe pain called vaso-occlusive crises.
Several types of gene mutations lead to different subtypes of SCD. Sickle cell anemia is the most common and one of the most severe forms. SCD life expectancy tends to be poorer for people with sickle cell anemia or other severe subtypes.
However, medical advances have extended the average lifespan of people with SCD. Experimental therapies currently in testing could continue to improve the overall prognosis for patients.
Life expectancy
Generally, people with SCD have a shorter life expectancy than people without the condition.
A 2023 U.S.-based study of people with SCD on government-sponsored healthcare (Medicare or Medicaid) showed an expected lifespan of 52.6 years. This works out to about 20 years less than the average lifespan of a person in the U.S.
Compared to past decades, these results show a vast improvement in SCD outlook — in the early 20th century, most people with SCD didn’t survive into adulthood. This increasing life expectancy may reflect new, more effective therapies and medical technologies, as well as improvements in care and diagnosis.
Limited data make it difficult to estimate life expectancy internationally or to assess the relative life expectancy of sickle cell anemia compared with less severe types.
Risk factors that affect sickle cell life expectancy
A variety of factors can affect SCD life expectancy, including:
- genetics and disease type: The prognosis of sickle cell anemia and other more severe SCD types is poorer compared with milder forms of the disease.
- access to treatment: Access to disease-modifying therapies or potentially curative treatments can improve outcomes and may increase life expectancy.
- complications: Frequent or more severe SCD complications are associated with a poorer prognosis.
- sex: Some studies have suggested that females with SCD have a longer estimated life expectancy than males.
- biological markers: Certain biological markers, including low fetal hemoglobin levels and elevated white blood cell counts, are associated with poorer outcomes.
Geography and socioeconomic status may also affect prognosis by influencing access to diagnosis, treatment, and monitoring.
How complications can affect prognosis
Complications of SCD can arise when blood flow to certain areas of the body becomes blocked or when the disease compromises the immune system. These complications can decrease quality of life, negatively impact prognosis, and, in some cases, be fatal.
Promptly and effectively treating complications can reduce the risks of long-term problems later in life.
Complications that may affect SCD life expectancy include:
- stroke: Interruptions in blood flow and oxygen supply to the brain may cause neurological damage.
- serious infections: SCD can affect the spleen and impair immune function, making the body more vulnerable to infections.
- respiratory problems: Problems with blood flow in the lungs or lung infections can lead to a serious condition called acute chest syndrome, which can be life-threatening.
- kidney, heart, or liver disease: Prolonged restrictions in blood and oxygen supply can damage specific organs, potentially leading to organ failure.
The importance of treatment and preventive care
SCD treatment typically involves a combination of medications, preventive measures, and regular monitoring to manage symptoms and reduce the risk of complications.
Types of treatments and preventive care strategies that can help improve life expectancy include:
- SCD medications: Hydroxyurea and other approved therapies can ease symptoms and increase overall survival.
- blood transfusions: These can reduce the risk of stroke and acute chest syndrome.
- stem cell transplant: This approach may cure SCD in some cases.
- antibiotics and vaccines: These can help reduce the risk of infections.
- regular transcranial Doppler ultrasounds: These tests can help assess stroke risk, allowing doctors to take preventive measures if necessary.
Many people with SCD benefit from mental healthcare and education, which healthcare providers may be able to help with. This is important for overall well-being and allows people with SCD to take appropriate precautions and make informed decisions about lifestyle and treatment.
Why access to care matters
While comprehensive care is crucial for people living with SCD, many individuals face systemic barriers that affect their access to treatment. Factors that affect access can include socioeconomic status and the availability of specialized treatment centers in a person’s area of residence. Racial and ethnic disparities in healthcare access and quality are also particularly relevant to SCD because the disease disproportionately affects Black people and other racial or ethnic minority groups.
Even with access to healthcare providers, many people with SCD report feeling stigmatized when seeking care for the condition.
Combined, these problems lead to substantial unmet needs for many patients. For example, the U.S. Centers for Disease Control and Prevention estimated that at least half of children with sickle cell anemia in the country in 2019 were not receiving hydroxyurea or transcranial Doppler ultrasounds as recommended. This gap in care could adversely affect the prognosis for patients with sickle cell anemia.
Similarly, global sickle cell survival rates are lowest in sub-Saharan Africa. Experts believe this is related to limited access to care and diagnostic screening.
Questions to ask your doctor about long-term outlook
Asking questions and seeking out information about SCD can help patients and families plan for the future and take appropriate precautions. In addition to questions about how the disease works, doctors may be able to help answer questions, such as:
- How severe is my SCD, and what can I do to help prevent complications?
- Am I eligible for any clinical trials, and could experimental treatments improve my quality of life or long-term outlook?
- What psychological or social support services are available, and how can I access them?
- What should I know about family planning, and should I speak with a genetic counselor?
- When should I seek emergency medical care?
Maintaining an open dialogue can help ensure that SCD families and care teams are on the same page, supporting better outcomes.
Sickle Cell Disease News is strictly a news and information website about the disease. It does not provide medical advice, diagnosis, or treatment. This content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.
