Omar Adwan: Rare Genetic Disorders of Red Blood Cell Membrane Abnormalities
Omar Adwan, Medical Laboratory Technologist at Modawah lab center, shared a post on LinkedIn:
“Hereditary Stomatocytosis , Hereditary Xerocytosis and Hereditary Cryohydrocytosis
Hereditary Stomatocytosis , Hereditary Xerocytosis are rare genetic disorders inherited in an Autosomal dominant pattern, characterized by abnormalities in red blood cell sodium (Na⁺) and potassium (K⁺) permeability.
Hereditary Cryohydrocytosis is considered a subtype of hereditary stomatocytosis.
All 3 conditions cause hemolysis and anemia, with severity ranging from mild to severe.
The main clinical manifestations are the same as in other forms of hemolytic anemia.
1.Hereditary Stomatocytosis The hallmark feature water-laden erythrocytes.
Excessive influx of Na⁺ and water from the plasma, exceeding the loss of K⁺, leads to swollen red cells. Laboratory findings include:
- Increased mean corpuscular volume (high MCV)
- Low mean corpuscular hemoglobin concentration (low MCHC)
- Increased osmotic fragility
Blood smears show stomatocytes, sometimes mixed with spherocytes.
2.Hereditary Cryohydrocytosis
A milder variant of Hereditary Stomatocytosis.
The abnormality is a marked increase in Na⁺ permeability at temperatures below 20 °C, exceeding the ability of the cell to pump Na⁺ back out.
As a result:
- Red cells swell
- Partial hemolysis occurs when blood is stored in the refrigerator overnight
3.Hereditary Xerocytosis (also called dehydrated Hereditary Stomatocytosis)
This is the most common inherited red cell cation permeability disorder.
Key features
- A mild increase in K⁺ permeability causes progressive loss of K⁺ and water leading to red cell dehydration, stiffness, and hemolysis
- Red cells are macrocytic despite dehydration, with high MCHC and resistance to osmotic fragility
- Laboratory findings
- Hemoglobin (Hb) and hematocrit (Hct) are often within the normal range (compensated hemolysis)
- Blood smears appear mostly normal, with only a few target cells present
- HSt: overhydrated, low MCHC
- HX: dehydrated, high MCHC
- HC: cold-sensitive Na⁺ leak.”
-
Apr 22, 2026, 14:10Alan Nurden: Pregnancy Challenges and Bleeding Risks in Inherited Platelet Disorders
-
Apr 22, 2026, 12:57Ali AlBahar: DNA Drives the Molecular Era of Blood Typing
-
Apr 22, 2026, 11:47We Are Excited to Introduce You to the 11th Editor-in-Chief Dr. Bob Löwenberg – Blood Journals Portfolio
-
Apr 22, 2026, 11:35Congratulations to Donald Arnold for Being Recognized with The ISTH 2026 Harold R. Roberts Award
-
Apr 22, 2026, 11:27Prashasti Dahiya: Key Molecular Insights on Thromboinflammation and Angiogenesis in Pediatric Cancer
-
Apr 22, 2026, 11:17Jack Hadfield: Understanding the Immune and Genetic Basis of VITT Post-COVID Vaccines
-
Apr 22, 2026, 07:56Shruti Kharat: Closing the Gap in Early Detection of Factor VIII Inhibitors
-
Apr 22, 2026, 07:46Gregory Piazza: Ushering in a New Era in PE Therapy and Improved Clinical Outcomes for Our Patients
-
Apr 22, 2026, 07:40Akshat Jain: WIL33 Study Advances Factor Prophylaxis in Children with von Willebrand Disease