What this test measures
Aldolase is an enzyme of glycolysis (the cell's primary energy pathway) that splits fructose-1,6-bisphosphate into two three-carbon molecules. It exists as three isoforms — A (muscle, red cells, brain), B (liver, kidney, intestine), and C (brain). Serum aldolase mainly reflects muscle and liver activity.
It is released into blood when muscle or liver cells are damaged. The test is largely used today as a supportive marker in inflammatory myopathies (polymyositis, dermatomyositis) and muscular dystrophies (Duchenne and Becker), where it can complement CK (creatine kinase) and reflect disease activity.
Why it matters
In India, aldolase is a niche test ordered mostly when CK is equivocal in suspected polymyositis, dermatomyositis, inclusion body myositis, or muscular dystrophy. Some patients with active inflammatory myopathy have a normal or only mildly raised CK but a raised aldolase — making it a useful adjunct rather than a stand-alone test.
Aldolase is also raised in acute hepatitis, haemolysis, muscle injury (crush injury, rhabdomyolysis), and some tumours. It is not used for routine liver evaluation (SGPT/SGOT are more specific) or for routine muscle screening (CK is the first-line test).
How to prepare
No fasting required. Avoid vigorous exercise in the 24 hours before — strenuous activity can transiently raise aldolase from muscle. Mention all medications (statins and fibrates can cause muscle injury and raise aldolase).
Markers & reference ranges
Reference ranges below are typical adult values. Your lab's reported range may differ slightly based on the assay platform and patient demographics — always read your report against the range printed on it.
| Marker | Normal range | If low | If high |
|---|---|---|---|
| Aldolase (U/L)[1][2] | 1.0 – 7.5 (method-dependent — confirm with lab) | Low aldolase is not clinically significant. Rare genetic aldolase deficiency exists. | Mild rise — muscle exercise, minor muscle injury, mild myositis, hepatitis. Moderate-to-marked rise — active polymyositis / dermatomyositis (especially when CK is high), muscular dystrophy (Duchenne, Becker — values can be 10–20× normal in children), acute viral hepatitis, rhabdomyolysis, haemolytic anaemia. Aldolase is interpreted with CK, AST, LDH and clinical picture. |
Muscle enzyme markers — when each is useful
| Marker | Best use | Notes |
|---|---|---|
| CK (Creatine Kinase) | First-line for any muscle disease — myositis, dystrophy, rhabdomyolysis | Most sensitive; rises in cardiac and skeletal muscle injury |
| Aldolase | Adjunct in inflammatory myopathies when CK is normal or equivocal | Less sensitive but adds value in seronegative or smouldering myositis |
| LDH | Non-specific tissue damage marker; raised in muscle, haemolysis, liver, tumour | Not used alone for muscle disease |
| AST (SGOT) | Liver and muscle; differentiates with ALT and CK | Rises in muscle injury too — confusing in pure muscle disease |
| Myoglobin | Rises early in rhabdomyolysis; cleared rapidly | Useful in acute crush injury and rhabdo monitoring |
Frequently asked questions
When is aldolase ordered?
Mainly when an inflammatory myopathy (polymyositis, dermatomyositis) or muscular dystrophy is suspected and CK is normal or only mildly raised — aldolase can be a more sensitive marker in those situations.
Do I need to fast?
No fasting required. Avoid strenuous exercise for 24 hours before — it can transiently raise aldolase.
My CK is normal but aldolase is high. What does that mean?
In some myopathies (especially dermatomyositis) aldolase can be raised even when CK is normal. Combined with skin changes, weakness or imaging findings, it supports the diagnosis and prompts further workup (EMG, MRI, biopsy, autoimmune panel).
Is aldolase used in liver disease?
It can rise in acute hepatitis but is not used routinely — SGPT/SGOT are more specific. Aldolase is a muscle-focused test in most labs.
Can children have aldolase tested?
Yes — it is sometimes part of the workup for muscular dystrophy in boys, where it can be 10–20 times the upper limit. CK is the primary test; aldolase is supportive.
Does exercise raise aldolase?
Yes — heavy or unaccustomed exercise can mildly raise aldolase from skeletal muscle. Rest 24 hours before testing.
Related Liver / Enzymes tests
Tests commonly ordered alongside ALDOLASE, or that help interpret an unexpected result.
Sources & references
- NIH MedlinePlus — Aldolase Test · accessed 2026-05-30T00:00:00.000Z
- NCBI StatPearls — Aldolase · accessed 2026-05-30T00:00:00.000Z
- Mayo Clinic Laboratories — Aldolase, Serum · accessed 2026-05-30T00:00:00.000Z
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