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HelpTest Code ALDO Aldolase, Serum
Additional Codes
| Mayo Test ID |
|---|
| ALS |
Reporting Name
Aldolase, SUseful For
Detection of muscle disease
Method Name
Photometric
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
Serum RedSpecimen Required
Supplies: Sarstedt 5 mL Aliquot Tube (T914)
Collection Container/Tube: Red top (serum gel/SST are not acceptable)
Submission Container/Tube: Plastic vial
Specimen Volume: 1 mL
Collection Instructions:
1. Within 1 hour of collection, centrifuge and aliquot serum into a plastic vial.
2. Send refrigerated.
Specimen Minimum Volume
0.5 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum Red | Refrigerated (preferred) | 7 days | |
| Frozen | 60 days |
Reject Due To
| Gross hemolysis | Reject |
| Gross lipemia | Reject |
| Gross icterus | Reject |
Reference Values
<18 years: <14.5 U/L
≥18 years: <7.7 U/L
Day(s) Performed
Monday through Sunday
CPT Code Information
82085
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| ALS | Aldolase, S | 1761-6 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| ALS | Aldolase, S | 1761-6 |
Clinical Information
Aldolase is necessary for glycolysis in muscle as a rapid response pathway for production of adenosine triphosphate independent of tissue oxygen.
Aldolase catalyzes the conversion of fructose 1,6-diphosphate into dihydroxyacetone phosphate and glyceraldehyde 3-phosphate, an important reaction in the glycolytic breakdown of glucose to lactate in muscle.
Aldolase is a tetramer whose primary structure depends upon the tissue from which it was synthesized (highest expression in liver, muscle, brain).
Elevated values are found in muscle diseases, such as Duchenne muscular dystrophy, dermatomyositis, polymyositis, and limb-girdle muscular dystrophy. While elevated creatinine kinase (CK) levels are more sensitive and specific for muscle disease, occasionally elevated aldolase is observed in some patients with myositis that have normal CK values.
Interpretation
Measuring serum muscle enzymes is common in the evaluation of patients with muscle weakness or muscle myalgia. When elevated, serum muscle enzymes can help differentiate muscle disease derived muscle weakness from a neurogenic cause. The highest levels of aldolase are found in progressive (Duchenne) muscular dystrophy. Lesser elevations are found in dermatomyositis, polymyositis, and limb-girdle muscular dystrophy. In dystrophic conditions causing hyperaldolasemia, the increase in aldolase becomes less dramatic as muscle mass decreases.
Cautions
No significant cautionary statements
Method Description
The aldolase activity is determined from the rate at which reduced nicotinamide adenine dinucleotide (NADH) is oxidized to NAD(+) and is measured photometrically by a decrease in absorbance. For each mole of substrate hydrolyzed, 2 moles of coenzyme (NADH) are oxidized. This 1:2 ratio is applied in the calculation of aldolase activity. Lactate dehydrogenase is present in the reagent for the purpose of eliminating interference from endogenous pyruvate in the specimen.(Package insert: Aldolase Reagent. Roche Diagnostics; V 5.0, 01/2021)