Biochemistry True regarding PKU is all except:- A Due to deficiency of phenyl alanine hydroxylase B Neurological symptoms are due to excess phenyl alanine C Blood phenyl alanine level >20 mg/dl causes severe disease D Method of choice for screening is urinary phenyl alanine by Guthrie;s test 💡 Explanation True regarding PKU is all except:- ✓ Correct Answer: D. Method of choice for screening is urinary phenyl alanine by Guthrie;s test