Dehydrated hereditary stomatocytosis

What it is

From: Orphanet

A rare hemolytic anemia characterized by a decreased red cell osmotic fragility due to a defect in cation permeability, resulting in red cell dehydration of variable degree, and mild to moderate compensated hemolysis. Pseudohyperkalemia (loss of potassium ions from red cells on storage at room temperature) is sometimes observed.

Reported clinical features and what the terms mean

The following findings are associated with this condition in Orphanet. They are not a checklist for diagnosing yourself, and they do not all occur in every affected person. Some are examination, imaging or laboratory findings that cannot be recognised at home.

The frequency labels describe how often a finding was reported among people with the condition in the source. They do not give the chance that a person with that symptom has the condition. Definitions below reproduce HPO terminology; they explain the term, not the likely severity in an individual.

Hemolytic anemia · Very frequent (99-80%)

A type of anemia caused by premature destruction of red blood cells (hemolysis).

Increased red cell osmotic fragility · Very frequent (99-80%)

Nonspherocytic hemolytic anemia · Very frequent (99-80%)

Abnormality of potassium homeostasis · Frequent (79-30%)

Any deviation from the normal concentration of potassium(1+) in the blood circulation.

Cholelithiasis · Frequent (79-30%)

Hard, pebble-like deposits that form within the gallbladder.

Hypochromia · Frequent (79-30%)

A qualitative impression that red blood cells have less color than normal when examined under a microscope, usually related to a reduced amount of hemoglobin in the red blood cells.

Increased circulating ferritin concentration · Frequent (79-30%)

Increased concentration of ferritin in the blood circulation.

Increased circulating lactate dehydrogenase concentration · Frequent (79-30%)

An elevated level of the enzyme lactate dehydrogenase in the blood circulation.

Increased total bilirubin · Frequent (79-30%)

Increased concentration of total (conjugated and unconjugated) bilirubin in the blood.

Macrocytic anemia · Frequent (79-30%)

A type of anemia characterized by increased size of erythrocytes with increased mean corpuscular volume (MCV) and increased mean corpuscular hemoglobin (MCH).

Reticulocytosis · Frequent (79-30%)

An elevation in the number of reticulocytes (immature erythrocytes) in the peripheral blood circulation.

Schistocytosis · Frequent (79-30%)

The presence of an abnormal number of fragmented red blood cells (schistocytes) in the blood.

Splenomegaly · Frequent (79-30%)

Abnormal increased size of the spleen.

Abdominal pain · Occasional (29-5%)

An unpleasant sensation characterized by physical discomfort (such as pricking, throbbing, or aching) and perceived to originate in the abdomen.

Other findings in the same source

From: Orphanet

Additional reported features include Anemia of inadequate production (Occasional (29-5%)); Congenital hemolytic anemia (Occasional (29-5%)); Edema (Occasional (29-5%)); Episodic fatigue (Occasional (29-5%)); Increased circulating hemoglobin concentration (Occasional (29-5%)); Increased mean corpuscular hemoglobin concentration (Occasional (29-5%)); Increased mean corpuscular volume (Occasional (29-5%)); Intermittent jaundice (Occasional (29-5%)); Neonatal hyperbilirubinemia (Occasional (29-5%)); Thromboembolism (Occasional (29-5%)). This is a selected summary, not a complete description of the condition.

When it may begin

From: Orphanet

Antenatal; Neonatal

Inheritance in the source

From: Orphanet

Autosomal dominant

Frequency and the population described

From: Orphanet

Point prevalence: <1 / 1 000 000; Worldwide; Class only. Reported family(ies): 20.0; Worldwide. This is a published case count, not prevalence. Point prevalence: 1-5 / 10 000; Denmark; Value and class. Point prevalence: 1-9 / 100 000; North America; Value and class.

Understanding the inheritance label

From: MedlinePlus Genetics

An autosomal dominant pattern means that one altered copy of a relevant gene can be sufficient for the condition. Some affected people inherit the change; others have a new change without an affected parent. The precise finding, family history and condition determine what this means for relatives.

Which doctor should you see?

The suggested department for discussing Dehydrated hereditary stomatocytosis is Haematology, with a haematologist as the relevant type of clinician. General physician / Family Medicine; paediatrician for children. Referral depends on symptoms.

Additional services that may be relevant, depending on the findings, include: Clinical Genetics.

This is an editorial referral starting point. The appropriate clinic depends on the person’s age, symptoms, previous diagnosis and local services. The first clinician can decide whether another specialty or a team is needed; a department label does not confirm the diagnosis.

How to prepare for an assessment

Bring a short timeline of the main symptoms: when they first appeared, whether they are constant or episodic, what seems to change them, and how they affect daily activities. Include previous reports, discharge summaries, current medicines and supplements, allergies, and any relevant family history. A dated record is more useful than trying to match every feature in an online article.

Ask the clinician what is already established and what remains uncertain. If a test is suggested, ask what question it answers, what its limitations are and how the result would change the next step. The information here is not an instruction to arrange every possible test. In children, bring growth, developmental and school information if it is relevant to the concern.

• Which blood-cell, marrow, bleeding or clotting finding matters most?
• Does the diagnosis need confirmation or a more precise subtype?
• Which symptoms or laboratory changes should trigger earlier review?

Treatment discussions and follow-up

The material gathered for this draft does not provide a complete condition-specific treatment pathway for Dehydrated hereditary stomatocytosis. That gap does not mean that treatment is unavailable. A clinician needs to establish the diagnosis and review current guidance before recommending medicines, procedures, rehabilitation or other support.

Before leaving the appointment, clarify the next review date, who will communicate results, and whom to contact if the situation changes. Discuss difficulties with sleep, work, school, mobility, eating or emotional wellbeing when these are relevant. Practical support may require coordination between the treating clinician and other services.

The collected references do not establish a complete prevention or long-term outlook section for this entry. Missing information should not be interpreted as proof that prevention is impossible or that a particular outcome is inevitable. Ask what is known for the exact subtype, stage and personal circumstances, and which uncertainties remain.

When to seek emergency help

Severe breathing difficulty, collapse, new stroke-like symptoms, a seizure that is prolonged or repeated without recovery, uncontrolled major bleeding, or an immediate risk of self-harm require emergency help. In India, call 112 or reach the nearest emergency department. This is a general, non-exhaustive warning list; it is not a condition-specific triage tool.