CBC won't show low ferritin. You can feel awful if your hemoglobin is OK but your ferritin is low.

Interesting!

DellaValle DM, Haas JD. Impact of iron depletion without anemia on performance in trained endurance athletes at the beginning of a training season: a study of female collegiate rowers. Int J Sport Nutr Exerc Metab. 2011;21(6):501-6. Accessed April 10, 2023. https://www.qxmd.com/r/22089308

Any doctor worth their salt should and will do this if you come in complaining about fatigue. They did with me. Someone presenting specific symptoms isn't going to get just a CBC.

I give a moment of silence to all the people on antidepressants who are actually iron and/or vitamin deficient and don't know it.

They should. At least here they do. I know this is how we detected my mom's hemochromatosis.

A CBC is a specific and very common lab test and does not include a ferritin level. It’s a separate test.