Daises28--Welcome to the boards!
I don't know how old you are but a visit to your GI doc may be in order. They can check a few things of the list as a cause for a low ferritin. Its good that you have had a colonoscopy. Have you donated blood in the last year, when was your last time? If you don't fill up the stores they can continue to fall due to periods, over time. FLFG
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Best of luck to you! FLFLOWERGIRL

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Hashimoto's Thyroiditis / FM
Moderate Anemia (resolved), Low Ferritin-- Work in progress (Endometrial Ablation)
Hiatal Hernia--GERD