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Bare lymphocyte syndrome (BLS) is an inherited condition of the immune system, and is known as a "primary immunodeficiency."
Children inherit the BLS gene from their parents. Both must carry the genetic mutation for BLS, but may not have symptoms of the disease.
The body's immune system is responsible for fighting infections and anything it sees as foreign invaders to the body.
In BLS, the body has a shortage of immune proteins called major histocompatibility complex (MHC) class I and II proteins. MHC proteins attack bacteria or viruses that enter the body.
Doctors also call BLS MHC class II deficiency or HLA class I deficiency.
BLS is a rare disease.
Since BLS symptoms are much the same as symptoms of other childhood illnesses, doctors don't know how many people have the disease.
Depending on how severe the disease is, children may have symptoms before one year of age or not until later in childhood.
BLS symptoms may be longer-lasting and more severe than those of other childhood diseases.
Some symptoms of BLS are:
Children with primary immune deficiencies like BLS are:
Doctors diagnose BLS through blood tests. Testing for certain immune markers in the blood lets us see how well the immune system is functioning.
Your child may also need a chest x-ray to see whether BLS has caused damage to the lungs.
We also offer genetic testing at UPMC Children’s Hospital of Pittsburgh of UPMC.
The goals of BLS treatment are to:
Children with BLS may need aggressive treatment for any infections they have. If your child doesn't have any infections, your doctor might prescribe antibiotics to prevent them.
Your child needs to avoid live vaccines and may need IVIG therapy.
If BLS is causing severe health problems such as lung failure, your child may benefit from a:
The Hillman Center for Pediatric Transplant has the only program in the world that offers tandem lung and bone marrow transplantation.
We also pioneered a reduced-intensity bone marrow transplant program. The program helps reduce the negative effects a bone marrow or stem cell transplant has on the body's organs.
Because transplants are high-risk treatments, your child may need to remain on lifelong medication.
Chief, Bone Marrow Transplantation and Cellular Therapies
Dr. Szabolcs is a pioneer in reduced-toxicity/intensity unrelated donor cord blood transplant for inborn errors of immunity. He's the first to prove the feasibility of sequential lung and bone marrow transplantation from the same unrelated deceased donor.
If a doctor diagnosed your child with bare lymphocyte syndrome, we want you to know you're not alone. The Center for Rare Disease Therapy is here to help.
To make an appointment for your child or refer a patient for BLS care, contact us by:
Here’s what you can expect when you come to us for your child's first BLS consult.
In most cases, we can see a new patient within 1 to 2 weeks.
We'll ask the referring doctor to send your child's medical records so we can review them before your visit.
You can expect your first visit to take from 4 to 6 hours.
Your child will receive a complete assessment from Paul Szabolcs, MD, chief of Bone Marrow Transplantation and Cellular Therapies.
Dr. Szabolcs will make or confirm a precise diagnosis and find out how much the disease has progressed.
Because we work as a team here at the center, other doctors and staff might see your child during your visit.
These may include specialists in:
Members of your child's BLS care team will talk with you about:
If surgery might be an option for treating your child's BLS, we'll discuss all the details. We'll let you know how you and your child can prepare.
By the end of your visit, you will have a care plan tailored to your child’s needs. We'll also schedule a follow-up visit in 3 months.
You'll meet our nurse practitioner (NP). You can contact our NP by phone or video conference with any concerns you have between now and your next appointment.
Before you leave, please feel free to ask us about your child's BLS diagnosis, treatment, or anything else on your mind.
You will get a phone call within 2 weeks to discuss the test results and next steps for your child's BLS care.
You can also find your child's test results if you signed up for myCHP — Children's patient portal.
myCHP lets you manage your child's health online. It's a free service for patients, parents, and guardians of Children's Hospital of Pittsburgh of UPMC.
When a child has a rare disease like bare lymphocyte syndrome, it affects the whole family.
At the Center for Rare Disease Therapy, we see each family member as our partners.
The best care approach happens when we merge our BLS expertise with your knowledge of what’s best for your child.
Contact us to learn more about BLS or make an appointment for your child:
Learn how families are finding help and hope at the Center for Rare Disease Therapy at UPMC Children’s Hospital of Pittsburgh. View Center for Rare Disease Therapy patient stories. »
Bilateral Orthotopic Lung Transplant (BOLT) in Tandem With CD3+ and CD19+ Cell Depleted Bone Marrow Transplant (BMT) From Partially HLA-Matched Cadaveric Donors
Study of Reduced-Intensity Conditioning In Patients With Non-Malignant Disorders Undergoing Umbilical Cord, Bone Marrow, or Peripheral Blood Stem Cell Transplantation
Children's Hospital's main campus is located in the Lawrenceville neighborhood. Our main hospital address is:
UPMC Children’s Hospital of Pittsburgh
One Children’s Hospital Way
4401 Penn Ave.
Pittsburgh, PA 15224
In addition to the main hospital, Children's has many convenient locations in other neighborhoods throughout the greater Pittsburgh region.
With myCHP, you can request appointments, review test results, and more.
For questions about a hospital bill call:
To pay your bill online, please visit UPMC's online bill payment system.
Interested in giving to Children's Hospital? Support the hospital by making a donation online, joining our Heroes in Healing monthly donor program, or visiting our site to learn about the other ways you can give back.