True about serology of rickets is –
Rickets is a metabolic disorder of growing bone (immature skeleton) primarily caused by lack of -

i)    Vitamin D or                  ii) Calcium or                       iii)          Phosphate

The end result is defective mineralization of bone.
Depending on the cause - Rickets is classified into following types -

Clinical variants of Rickets
a
b
c
d