What measurement is useful for detecting iron deficiency in its earliest stage?

Question

Quizplus · Accepted Answer

Serum ferritin is the best measurement for detecting iron deficiency in its earliest stage because it reflects the amount of stored iron in the body. A low serum ferritin level is an early indication of iron deficiency before anemia develops. Hematocrit, serum iron level, red blood cell count, and transferrin saturation are less sensitive and specific than serum ferritin for detecting early iron deficiency.

What Measurement Is Useful for Detecting Iron Deficiency in Its