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Isolated hyperCKemia
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

Isolated hyperCKemia

Isolated hyperCKemia is a rare, typically asymptomatic condition characterized by elevated blood levels of the enzyme creatine kinase. Although often linked to muscle diseases, individuals with this condition experience no muscle weakness or functional impairment.

Description

Isolated hyperCKemia is a condition characterized by elevated levels of an enzyme called creatine kinase in the blood. In affected individuals, levels of this enzyme are typically 3 to 10 times higher than normal. While elevated creatine kinase often accompanies various muscle diseases, individuals with isolated hyperCKemia have no muscle weakness or other symptoms. Some people with this condition have abnormalities of muscle cells that can be seen with a microscope, such as unusual variability in the size of muscle fibers, but these changes do not affect the function of the muscle.

Frequency

The prevalence of isolated hyperCKemia is unknown. Because the condition has no symptoms, it is likely that some cases never come to medical attention.

Causes

Isolated hyperCKemia is one of a group of conditions called caveolinopathies, which are caused by mutations in the CAV3 gene. The CAV3 gene provides instructions for making a protein called caveolin-3, which is found in the membrane surrounding muscle cells. This protein is the main component of caveolae, which are small pouches in the muscle cell membrane. Within the caveolae, the caveolin-3 protein acts as a scaffold to organize other molecules that are important for cell signaling and maintenance of the cell structure.

CAV3 gene mutations result in a shortage of caveolin-3 protein in the muscle cell membrane and a reduction in the number of caveolae. Researchers suggest that a shortage of caveolae impairs the structural integrity of muscle cells, interferes with cell signaling, and causes the self-destruction of cells. Creatine kinase is released when muscle cells are broken down. Although no muscle weakness occurs in isolated hyperCKemia, destruction of some muscle cells may lead to the elevated blood levels of creatine kinase that characterize this condition.

In addition to isolated hyperCKemia, CAV3 gene mutations can cause other caveolinopathies including CAV3-related distal myopathy, limb-girdle muscular dystrophy, rippling muscle disease, and a heart disorder called hypertrophic cardiomyopathy. Several CAV3 gene mutations have been found to cause different caveolinopathies in different individuals. It is unclear why a single CAV3 gene mutation may cause different patterns of signs and symptoms, even within the same family.

Associated Gene

  • CAV3

Inheritance

This condition is inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder. In most cases, an affected person has one parent with isolated hyperCKemia or another caveolinopathy. Rare cases result from new mutations and occur in people with no history of caveolinopathies in their family.

Other Names for This Condition

  • Elevated serum CPK
  • Elevated serum creatine phosphokinase
  • H-CK
  • Idiopathic hyperCKemia
  • Idiopathic persistent elevation of serum creatine kinase

Frequently Asked Questions

Yes, isolated hyperCKemia is a genetic condition, often caused by mutations in the CAV3 gene. While the specific inheritance pattern can vary depending on the mutation, it means that family members might also have elevated creatine kinase levels. Genetic
Isolated hyperCKemia is generally considered a benign condition that does not progress to cause muscle weakness or functional impairment. While some individuals may have microscopic muscle cell abnormalities, these changes do not typically affect muscle function. Long-term follow-up studies have shown that most individuals remain asymptomatic throughout their lives.
Diagnosis of isolated hyperCKemia involves confirming persistently elevated CK levels in the blood, typically 3 to 10 times the normal range, while ruling out other causes of high CK. This requires a thorough clinical evaluation to ensure there is absolutely no muscle weakness, pain, or functional impairment. Further tests, such as muscle biopsy or genetic testing for CAV3 gene mutations, may be performed to confirm the diagnosis and exclude other neuromuscular conditions.
While isolated hyperCKemia itself doesn't cause symptoms, identifying it is important to differentiate it from other serious muscle diseases that do cause weakness and require treatment. A diagnosis can prevent unnecessary investigations or treatments for other conditions. Genetic counseling may also be beneficial for family planning, as it is a genetic condition.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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