← All diseases

Inborn errors of metabolism

LCHAD deficiency (long-chain 3-hydroxyacyl-CoA dehydrogenase deficiency)

An inherited problem with burning fat. The body cannot turn certain fats into energy. Blood sugar drops during fasting; the heart, liver, muscles and eyes can be affected.

Not part of the panel of Türkiye's National Newborn Screening Programme (heel-prick test). Source

Orphanet has a guideline for emergency doctors for this disease (language: French). See on Orphanet

Prepare an emergency card

This page is translated from the Turkish original.

This disease is followed through the “Inborn errors of metabolism” group.

Understanding the disease

This section has not yet been reviewed by a physician. It summarises patient information from sources such as MedlinePlus, Orphanet and the NHS in plain language. The disease can differ from person to person; talk to your doctor about diagnosis and treatment.

What happens in this disease?

The body cannot burn fats called long-chain fats to make energy. These fats are found in milk and some oils. During fasting the body depends on these fats, so energy runs low. Fats that cannot be burned build up and can damage the liver, heart, muscles and eyes.

Which symptoms can occur?

Symptoms usually begin in infancy or early childhood. Fasting, illness or fever can trigger symptoms.

  • Feeding difficulties, nausea and vomiting
  • Weakness and sleepiness
  • Low blood sugar
  • Floppy muscles
  • Liver problems
  • Changes in the retina of the eye; over time, vision and night vision may decrease
  • In later childhood, muscle pain, muscle breakdown and loss of feeling in the arms and legs
  • Weakening of the heart muscle

How is it diagnosed?

In many countries, it can be found through newborn heel-prick screening. A screening result alone does not make the diagnosis. Blood and urine are checked for fat breakdown products. The diagnosis is confirmed with a genetic test.

Treatment and care

The basis of care is a special diet. Long-chain fats are reduced, and a special fat that the body can burn is added. The child is fed often and does not go without food for long. The doctor may recommend some additional nutritional supplements. On sick days, quick sugar support may be needed. The heart, eyes and development are checked regularly. A metabolic doctor and a dietitian work together. The doctor who follows the disease decides which treatment is suitable.

For the family: inheritance and genetic counselling

The disease is passed on through recessive inheritance. The mother and father are usually healthy carriers. For a couple who are both carriers, the chance of having an affected child is 1 in 4 in each pregnancy. When relatives marry, the chance that two carriers have children together is higher. Genetic counselling guides the family and future pregnancies.

Source: MedlinePlus Genetics: Long-chain 3-hydroxyacyl-CoA dehydrogenase deficiency · Baby's First Test: Long-Chain L-3 Hydroxyacyl-CoA Dehydrogenase Deficiency · NORD: Long chain 3-hydroxyacyl-CoA dehydrogenase deficiency

Key facts

How common is it?
Prevalence: 1-9 per 100 000 (Europe)
How is it inherited?
Autosomal recessive
When does it usually start?
Infancy, Newborn period
Gene(s) involved
HADHA

These facts are taken from Orphanet and MedlinePlus records (last checked: October 7, 2026). Frequency values are approximate ranges.

You are not alone: patient associations in Türkiye

Non-profit patient and family organizations in Türkiye working on this disease or disease group. Links are for information; Doktorclub is not affiliated with these organizations and does not endorse them.

We could not find a patient association specific to this disease.

For all rare diseases: Nadir Hastalıklar Federasyonu

Guides related to this disease

  • Special diets and medical nutrition · Metabolic diet, blood monitoring, medical formula and SGK report, sick-day plan, tube feeding and swallowing problems, school meals, supplement warning

Support and help

Doktorclub does not diagnose, recommend treatments or refer you to hospitals or doctors. These pages are meant to help you talk with your doctor.

News about LCHAD deficiency

Clinical trials (ClinicalTrials.gov)

A clinical trial is a regulated study that tests whether a new treatment is safe and whether it works, in patients who volunteer. Most trials look for a certain age, genetic change and health condition. Taking part is voluntary.

This list is not a treatment recommendation. Treatments tested in phase 1–3 trials are investigational (experimental): their efficacy and safety have not yet been proven and they are not approved treatments. Taking part depends on each trial’s criteria and a physician’s assessment; the first step is to talk to the doctor who manages your care.

ClinicalTrials.gov currently lists no active interventional studies for this disease. Last checked: October 7, 2026.

See all studies on ClinicalTrials.gov · Joining clinical trials

Inborn errors of metabolism: other news

Medical codes (for talking with your doctor and finding sources)

These codes identify the disease in international classifications and databases. They can help when you talk with your doctor or look for reliable sources.

Orphanet code: ORPHA:5

No separate ICD-11 code; WHO classifies this disease under: 5C52.01

Codes checked against WHO ICD-11 and Orphanet on October 7, 2026.

This page provides general information and does not replace diagnosis or treatment. Talk to your doctor about symptoms, diagnosis and treatment.

The information on these pages is for general information only and does not replace medical advice. Talk to your doctor about diagnosis and treatment decisions. In an emergency in Türkiye, call 112.

Every update is based on an open source and labeled with its level of evidence. No advertising and no drug brand names. Our scientific principles

This page was translated from Turkish by the Doktorclub editorial team.