Hypophosphatasia Diagnosis and Management

Introduction to Hypophosphatasia

• Normal adolescents have elevated alkaline phosphatase (ALP) levels due to active skeletal development, with bone-specific ALP representing 80-90% of total ALP in this age group, according to the American Academy of Pediatrics 1, 2

Diagnostic Considerations

• The American College of Medical Genetics recommends measuring serum phosphate, calcium, and parathyroid hormone to evaluate for metabolic bone disease and distinguish hypophosphatasia from other phosphate disorders 3, 4
• The Endocrine Society suggests checking 25-hydroxyvitamin D levels to exclude vitamin D deficiency as a cause of bone abnormalities 3
• The American Dental Association notes that dental history, including premature loss of primary teeth, "gray gums," dental abscesses, or periodontal disease, is relevant in diagnosing hypophosphatasia 5
• The Pediatric Endocrine Society recommends assessing growth patterns, including height velocity and any growth impairment, in the diagnostic workup for hypophosphatasia 6

Management and Treatment

• The National Institute of Child Health and Human Development advises genetic testing for ALPL gene mutations to confirm the diagnosis of hypophosphatasia 5, 6
• The American Academy of Pediatrics recommends multidisciplinary care involving endocrinology, orthopedics, and dentistry for patients with confirmed hypophosphatasia 5, 6
• The Endocrine Society suggests avoiding bisphosphonates in patients with hypophosphatasia, as they can cause atypical femur fractures 3, 4