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Diagnostic Approach to Abnormal Alkaline Phosphatase Value
Salvatore Minisola1, Cristiana Cipriani1, Luciano Colangelo1
1Department of Clinical, Internal, Anesthesiologic, and Cardiovascular Sciences, "Sapienza" University of Rome, Rome, Italy.
Mayo Clinic Proceedings
|February 28, 2025
Summary
Alkaline phosphatase (ALP) is a vital enzyme measured in blood for diagnosing skeletal and liver diseases. Understanding ALP levels and its various forms aids in identifying and managing numerous medical conditions.
Area of Science:
- Biochemistry and Clinical Diagnostics
- Enzymology
- Medical Biomarkers
Background:
- Alkaline phosphatase (ALP) is a crucial enzyme with fundamental roles, notably in skeletal mineralization.
- Its involvement in disease pathogenesis is increasingly recognized, making serum ALP a valuable clinical biomarker.
- Abnormal ALP levels are commonly linked to skeletal and biliary tract diseases.
Purpose of the Study:
- To provide a comprehensive overview of alkaline phosphatase (ALP) and its clinical significance.
- To outline a clinical approach for identifying diseases associated with abnormal ALP values.
- To explore the diagnostic and therapeutic roles of ALP, including its use in hypophosphatasia.
Main Methods:
- A narrative review based on a comprehensive PubMed search from inception to July 2024.
- Keywords included alkaline phosphatases, isozymes, isoforms, ALP variants (bone, liver, intestinal, placental), liver function tests, and related diseases.
- Emphasis on English-language articles, prioritizing those detailing differential diagnoses.
Main Results:
- Serum total ALP measurement is a standard part of initial patient biochemical evaluation.
- Electrophoretic assays are useful for visualizing increased ALP activity, while bone ALP immunoassays aid in bone/mineral disorder assessment.
- Abnormal ALP levels indicate various conditions, primarily affecting the skeleton and biliary system.
Conclusions:
- Alkaline phosphatase (ALP) is a fundamental enzyme with significant diagnostic utility in clinical practice.
- Specific assays can differentiate ALP isoforms to pinpoint disease causes.
- Emerging therapeutic applications, such as in hypophosphatasia, highlight the expanding role of ALP.
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