Hypophosphatasia and low alkaline phosphatase assessment
Hypophosphatasia is a rare inherited condition that affects the mineralisation of bones and teeth. In adults, it may be associated with bone pain, stress fractures, recurrent fractures, premature tooth loss, joint pain and persistently low alkaline phosphatase on blood tests.
Persistently low alkaline phosphatase can be an important clue. Specialist review can help decide whether hypophosphatasia or another metabolic bone condition needs investigation.
Hypophosphatasia affects how bones and teeth mineralise.
Hypophosphatasia, often shortened to HPP, is linked to low activity of alkaline phosphatase, an enzyme involved in normal bone and tooth mineralisation. When this process is disrupted, bones may become softer, weaker or more prone to fractures.
The condition can appear at different ages and varies widely in severity. Some people are diagnosed in childhood, while others are only recognised in adulthood after repeated stress fractures, persistent bone pain, dental problems or unexpectedly low alkaline phosphatase results.
- Assessment of suspected or confirmed hypophosphatasia
- Review of persistently low alkaline phosphatase blood results
- Investigation of recurrent fractures, stress fractures, bone pain or premature tooth loss
- Rare bone disease advice and long-term monitoring recommendations
What hypophosphatasia can look like
Symptoms depend on the age of onset and severity of the condition. Adult hypophosphatasia may be subtle and can be mistaken for other causes of bone pain, arthritis, tendon problems, osteoporosis or recurrent stress injury.
Low alkaline phosphatase
Persistently low ALP on blood tests can be an important clue, especially when symptoms fit the pattern.
Stress fractures
Recurrent stress fractures, particularly in the feet or thigh bones, may occur in adult hypophosphatasia.
Bone pain
Patients may experience chronic bone pain, musculoskeletal pain or pain linked to fractures.
Premature tooth loss
Early loss of adult teeth, or a history of early tooth loss in childhood, can be relevant.
Joint pain or inflammation
Some adults develop joint pain, inflammation, stiffness or calcium crystal-related symptoms.
Fatigue and mobility issues
Ongoing pain, fracture history and muscle symptoms may affect confidence, movement and daily activity.
Why hypophosphatasia happens
Hypophosphatasia is caused by changes in the ALPL gene, which affects tissue-nonspecific alkaline phosphatase activity. This enzyme is important for normal mineralisation of bones and teeth.
The condition may be inherited in different ways, and severity can vary significantly between individuals. Some people have severe disease from infancy, while others have milder adult forms that are recognised much later.
How hypophosphatasia is assessed
Assessment may include repeat alkaline phosphatase testing, review of calcium, phosphate, vitamin D, parathyroid hormone, bone markers, fracture history, dental history and imaging.
Specialist review is important because low alkaline phosphatase can have several possible causes. The clinical pattern, blood results, imaging and family history need to be considered together.
The key is connecting symptoms with the blood test pattern
A low alkaline phosphatase result may be overlooked if it is not interpreted alongside symptoms such as bone pain, stress fractures or premature tooth loss. In the right context, it can point towards an underlying mineralisation disorder.
Professor Keen can review whether the pattern fits hypophosphatasia, whether further investigations are needed and what monitoring or treatment advice is appropriate.
Related treatments and services
Hypophosphatasia is a rare inherited bone condition that needs careful specialist assessment. Review may include symptoms, fracture history, blood results, bone density, dental history and wider metabolic bone health factors.
A specialist consultation for suspected hypophosphatasia
Professor Keen will review your blood test history, alkaline phosphatase results, fracture history, bone pain, dental history, imaging, medications, family history and any previous diagnosis or genetic testing.
The consultation can help clarify whether hypophosphatasia is likely, whether additional tests are needed and what long-term management or monitoring may be suitable.
Hypophosphatasia questions
Common questions from patients with suspected hypophosphatasia, low alkaline phosphatase or unexplained fractures and bone pain.
What is hypophosphatasia?
Hypophosphatasia is a rare inherited condition that affects bone and tooth mineralisation. It is linked to low alkaline phosphatase activity and can cause bone pain, fractures and dental problems.
Does low alkaline phosphatase always mean hypophosphatasia?
No. Low alkaline phosphatase can have several causes. Hypophosphatasia is considered when the low result is persistent and fits the wider clinical picture, such as fractures, bone pain or premature tooth loss.
Can hypophosphatasia be diagnosed in adults?
Yes. Some people are diagnosed in adulthood after recurrent stress fractures, bone pain, dental issues or repeated low alkaline phosphatase results.
Can hypophosphatasia be mistaken for osteoporosis?
Yes. Some symptoms and scan findings may overlap, but the underlying condition is different. This is why specialist interpretation is important before deciding on treatment.
When should I seek specialist advice?
Specialist advice is helpful if you have persistently low alkaline phosphatase, recurrent stress fractures, unexplained bone pain, premature tooth loss or concern about rare bone disease.
Arrange a specialist hypophosphatasia appointment
If you have persistently low alkaline phosphatase, unexplained bone pain, stress fractures, premature tooth loss or suspected hypophosphatasia, please contact the practice to arrange an appointment.
Contact details
For private appointments and general enquiries, please contact the office.