Lab marker · Low

Low Bone-specific alkaline phosphatase: what it means

A Bone-specific alkaline phosphatase result below the normal range is considered low. Here is what a reduced Bone-specific alkaline phosphatase can point to, and when it is worth discussing with a doctor.

Reference range: ~6–20 µg/L (higher in children and post-menopausal women; assay-dependent); the bone-derived fraction of alkaline phosphatase — a marker of bone formation and turnover

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What a low Bone-specific alkaline phosphatase can mean

  • Normal or low — the expected result outside high-turnover bone conditions.
  • A fall on osteoporosis treatment — reflecting reduced bone turnover.
  • Rarely, hypophosphatasia — a genetic condition of low ALP.

When to discuss with a doctor

Bone-specific alkaline phosphatase is a targeted bone-turnover marker, most useful when a bone source needs to be separated from a liver source of a raised total ALP, and especially in Paget's disease of bone — where it helps judge how active the disease is and is tracked to monitor treatment. It also supports assessment of osteomalacia and other high-turnover bone states. It is interpreted alongside calcium, phosphate, vitamin D, other bone markers and imaging, not in isolation. Mediora.AI shows bone-specific ALP alongside total ALP, liver enzymes and the mineral markers so a bone-versus-liver source and the turnover pattern are visible; the interpretation belongs with your doctor.

Conditions this can relate to

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Mediora.AI is informational - interpretation, not a diagnosis. A single out-of-range value is common and often benign; always discuss decisions with your doctor.