My DS (2 years 9 months) has slightly elevated phosphatase levels. He has had low vitamin D and had a blood test to check this. The levels are much better but still slightly low. Gp thinks the elevated phosphatase levels might be to do with the low vitamin d but no one mentioned this when his levels Of vitamin d were really low. She has written to Paeds to ask their advice but just wondered if anyone had any experience or knowledge of this?