Dear Researchers,

Please, I want to know or have access to articles that could help me in classifying adolescents into varying levels of deficiency/sufficiency of iron, zinc, iodine, and vitamin A based on their biomarkers below

.

(A) For iron deficiency: serum iron not ferritin, transferrin or haemoglobin.

(B) For zinc deficiency: serum zinc

(C) For iodine deficiency: serum iodine not TSH etc

(D) For vitamin A deficiency: serum vitamin A

Regards!