Why are some specific indices (such as serum ferritin or transferrin receptor) generally considered a more reliable indicator for the measurement of iron levels than blood hemoglobin levels?
1
Because they respond more quickly to changes in iron levels in the diet.
2
Because the level of hemoglobin in the blood can show response to many other factors and diseases, such as lead poisoning, serious diseases, etc.
3
Because these specific iron indices can be measured more accurately and easily.
4
Because hemoglobin levels vary with age and between genders.