Guidance varies by professional organization.
2021 AGA clinical practice guidelines on the gastrointestinal evaluation of iron deficiency anemia:

2021 British Society of Gastroenterology (BSG) guideline on management of iron deficiency:

Jun
21
2022
Guidance varies by professional organization.
2021 AGA clinical practice guidelines on the gastrointestinal evaluation of iron deficiency anemia:
2021 British Society of Gastroenterology (BSG) guideline on management of iron deficiency: