This table lists symptoms that people with this disease may have. For most diseases, symptoms will vary from person to person. People with the same disease may not have all the symptoms listed. This information comes from a database called the Human Phenotype Ontology (HPO) . The HPO collects information on symptoms that have been described in medical resources. The HPO is updated regularly. Use the HPO ID to access more in-depth information about a symptom.
|Medical Terms||Other Names||
|80%-99% of people have these symptoms|
|Failure to thrive||
Weight faltering[ more ]
|Recurrent respiratory infections||
Frequent respiratory infections
Multiple respiratory infections
respiratory infections, recurrent
Susceptibility to respiratory infections[ more ]
Infection in blood stream
|Severe combined immunodeficiency||0004430|
|30%-79% of people have these symptoms|
Decreased blood lymphocyte number
Low lymphocyte number[ more ]
|5%-29% of people have these symptoms|
|Abnormality of the dentition||
Dental abnormality[ more ]
|Chronic otitis media||
Chronic infections of the middle ear
Abnormally small skull
Decreased circumference of cranium
Decreased size of skull
Reduced head circumference
Small head circumference[ more ]
|Recurrent urinary tract infections||
Frequent urinary tract infections
Urinary tract infection
Urinary tract infections
Urinary tract infections, recurrent[ more ]
|Sensorineural hearing impairment||0000407|
Increased spleen size
A diagnosis can be confirmed by blood tests. Blood tests show significantly lower-than-normal levels of T
Since there are other conditions that can result in lower-than-normal numbers of the different types of
Immunoglobulin levels are usually very low in SCID. Most commonly (but not always), all immunoglobulin classes are depressed (IgG, IgA, IgM and IgE).
The diagnosis of SCID can also be made before the baby is born if there has been another infant in the family with the disorder and if the
Early diagnosis, before the infant has had a chance to develop any infections, is very valuable since bone marrow transplants given in the first three months of life have a 94% success rate. In fact,
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Related diseases are conditions that have similar signs and symptoms. A health care provider may consider these conditions in the table below when making a diagnosis. Please note that the table may not include all the possible conditions related to this disease.
Conditions with similar signs and symptoms from Orphanet
Differential diagnoses include other combined B-cell and T-cell disorders, 22q11.2 deletion syndrome, congenital TORCH infection, X-linked or autosomal recessive agammaglobulinemia, and other forms of hypogammaglobulinemia (see these terms).
Visit the Orphanet disease page for more information.
Research helps us better understand diseases and can lead to advances in diagnosis and treatment. This section provides resources to help you learn about medical research and ways to get involved.
Support and advocacy groups can help you connect with other patients and families, and they can provide valuable services. Many develop patient-centered information and are the driving force behind research for better treatments and possible cures. They can direct you to research, resources, and services. Many organizations also have experts who serve as medical advisors or provide lists of doctors/clinics. Visit the group’s website or contact them to learn about the services they offer. Inclusion on this list is not an endorsement by GARD.
Living with a genetic or rare disease can impact the daily lives of patients and families. These resources can help families navigate various aspects of living with a rare disease.
These resources provide more information about this condition or associated symptoms. The in-depth resources contain medical and scientific language that may be hard to understand. You may want to review these resources with a medical professional.
NIH Hosts Rare Disease Day Event, Twitter Chat
January 24, 2019
Questions sent to GARD may be posted here if the information could be helpful to others. We remove all identifying information when posting a question to protect your privacy. If you do not want your question posted, please let us know. Submit a new question
In the case of X-linked SCID, if a girl has SCID it means she inherited a defective X gene from both parents. But if the father has a defective X gene, he would have to be affected with SCID. How can a father just be a carrier in the case of an affected daughter? And what is the risk in a subsequent pregnancy to have SCID if both parents are carriers? Is it possible for a male to be a carrier? See answer
My baby has low CD3 and CD4 cells. I have consulted a hematologist and was told it is doubtful my baby has SCID. When can we consider it is SCID? See answer