Significance of Elevated Aldolase Levels in Laboratory Testing

Primary Clinical Significance of Elevated Aldolase

Elevated aldolase levels primarily indicate muscle damage or injury, and can be a valuable diagnostic marker particularly when creatine kinase (CK) levels are normal, helping identify early muscle regeneration issues or specific myopathies, as recommended by the American College of Physicians 1

Aldolase testing helps differentiate between muscle injury and liver injury when liver enzymes (ALT/AST) are elevated, according to the American Association for the Study of Liver Diseases 2, 3
In patients with nonalcoholic steatohepatitis (NASH) who show elevated liver enzymes, testing for aldolase can confirm whether the elevation is due to muscle injury rather than liver damage, as suggested by the American Association for the Study of Liver Diseases 2, 3
Intensive exercise or statin therapy can cause elevations in ALT and AST due to muscle injury rather than liver damage, which aldolase testing can help confirm, as noted by the American Heart Association 2, 3

In patients receiving immune checkpoint inhibitor therapy, elevated aldolase along with CK can help diagnose immune-related myositis, according to the American Society of Clinical Oncology 1
For grade 1 myositis with mild weakness, elevated CK and/or aldolase may warrant oral corticosteroid treatment, as recommended by the American Society of Clinical Oncology 1
Blood testing for aldolase is part of the standard workup for suspected immune-related myositis along with CK testing, as suggested by the American Society of Clinical Oncology 1

In patients with NASH or those on clinical trials for liver disease, elevated transaminases with normal aldolase suggest liver injury, while elevated aldolase suggests muscle origin of enzyme elevations, according to the American Association for the Study of Liver Diseases 2, 3
For patients on statins with elevated liver enzymes, aldolase testing can help determine if the elevation is due to statin-related muscle injury rather than hepatotoxicity, as noted by the American Heart Association 3

Failing to consider muscle injury as a cause of elevated liver enzymes, particularly in patients who exercise intensively or are on statins, is a common pitfall, as warned by the American Association for the Study of Liver Diseases 2, 3

In myositis evaluation, aldolase should be measured alongside CK, AST, ALT, and LDH as part of the standard workup, as recommended by the American Society of Clinical Oncology 4
The American College of Rheumatology suggests that aldolase should be measured alongside CPK, LDH, AST, and ALT in every patient with suspected Juvenile Dermatomyositis (JDM) 5
Muscle enzymes including aldolase should be assessed regularly using standardized tools to monitor disease activity in JDM patients, according to the American College of Rheumatology 5
Aldolase may be elevated alongside CK, AST, ALT, and LDH in Pompe disease and other glycogen storage disorders, reflecting enzymes released from muscle tissue, as noted by the American College of Medical Genetics 6
The American College of Medical Genetics also states that these elevations reflect enzymes released from muscle tissue in Pompe disease and other glycogen storage disorders 7

In immune checkpoint inhibitor-related myositis with grade 1 symptoms, the National Comprehensive Cancer Network recommends continuing therapy but considering oral corticosteroids if both aldolase and CK are elevated 4
For grade 2 myositis (CK ≥3× ULN), the National Comprehensive Cancer Network suggests holding immune checkpoint inhibitor temporarily and initiating prednisone 0.5-1 mg/kg/day 4
The National Comprehensive Cancer Network also recommends referring to rheumatology or neurology for grade 2 or higher myositis 4