Overview
Alpha delta granule deficiency is a rare inherited blood disorder that affects tiny structures inside platelets called alpha granules and delta granules (also known as dense granules). Platelets are small blood cells that help your body stop bleeding by clumping together to form a clot. In this condition, both types of storage granules are either missing or not working properly, which means platelets cannot release the chemical signals needed to form a strong blood clot. This is sometimes called combined alpha-delta storage pool deficiency or alpha-delta SPD. The main effect of this condition is that the blood takes longer than normal to clot. People with alpha delta granule deficiency tend to bruise easily, have nosebleeds that are hard to stop, bleed heavily during or after surgery, and experience prolonged bleeding from cuts or dental procedures. Women may have very heavy menstrual periods. The bleeding is usually not life-threatening in everyday situations, but it can become serious during surgery, childbirth, or after a major injury. Treatment focuses on managing bleeding episodes rather than curing the underlying problem. Options include medications like desmopressin (DDAVP) to temporarily boost platelet function, antifibrinolytic drugs such as tranexamic acid to help clots stay in place, and platelet transfusions for more serious bleeding. There is currently no cure for this condition, but with careful planning and the right medical support, most people can live a relatively normal life.
Key symptoms:
Easy bruisingFrequent or prolonged nosebleedsHeavy or prolonged menstrual bleeding in womenBleeding that is hard to stop after cuts or injuriesExcessive bleeding during or after surgery or dental proceduresProlonged bleeding after childbirthSmall red or purple spots on the skin caused by minor bleeding (petechiae)Bleeding into joints or muscles in more severe cases
Autosomal dominant
Passed on from just one parent; each child has about a 50% chance of inheriting it
Variable
Can begin at different ages, from infancy through adulthood
Treatments
No FDA-approved treatments are currently listed for Alpha delta granule deficiency.
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Specialists
View all specialists →No specialists are currently listed for Alpha delta granule deficiency.
Treatment Centers
8 centersBaylor College of Medicine Rare Disease Center ↗
Baylor College of Medicine
📍 Houston, TX
🏥 NORDStanford Medicine Rare Disease Center ↗
Stanford Medicine
📍 Stanford, CA
🔬 UDNNIH Clinical Center Undiagnosed Diseases Program ↗
National Institutes of Health
📍 Bethesda, MD
🔬 UDNUCLA UDN Clinical Site ↗
UCLA Health
📍 Los Angeles, CA
🔬 UDNBaylor College of Medicine UDN Clinical Site ↗
Baylor College of Medicine
📍 Houston, TX
🔬 UDNHarvard/MGH UDN Clinical Site ↗
Massachusetts General Hospital
📍 Boston, MA
🏥 NORDMayo Clinic Center for Individualized Medicine ↗
Mayo Clinic
📍 Rochester, MN
👤 Mayo Clinic Center for Individualized Medicine
🏥 NORDUCLA Rare Disease Day Program ↗
UCLA Health
📍 Los Angeles, CA
Travel Grants
No travel grants are currently matched to Alpha delta granule deficiency.
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5 articlesCaregiver Resources
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Financial assistance programs specifically for caregivers of rare disease patients.
Social Security Disability
Learn how rare disease patients may qualify for SSDI/SSI benefits.
Questions for your doctor
Bring these to your next appointment
- Q1.What specific tests confirmed my diagnosis, and should other family members be tested?,Which medications or supplements should I completely avoid because they could worsen my bleeding?,What should I do — and who should I call — if I have a serious bleeding episode?,Do I need to take any medication before dental work, surgery, or other procedures?,Are there any activities or sports I should avoid?,If I am planning a pregnancy, what special precautions do I need to take?,Should I have genetic testing, and what might the results mean for my family?
Common questions about Alpha delta granule deficiency
What is Alpha delta granule deficiency?
Alpha delta granule deficiency is a rare inherited blood disorder that affects tiny structures inside platelets called alpha granules and delta granules (also known as dense granules). Platelets are small blood cells that help your body stop bleeding by clumping together to form a clot. In this condition, both types of storage granules are either missing or not working properly, which means platelets cannot release the chemical signals needed to form a strong blood clot. This is sometimes called combined alpha-delta storage pool deficiency or alpha-delta SPD. The main effect of this condition
How is Alpha delta granule deficiency inherited?
Alpha delta granule deficiency follows a autosomal dominant inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.