Can a CBC test detect vitamin deficiencies?

Yes, a CBC test can detect certain vitamin deficiencies by analyzing red blood cell size and count. For example, macrocytic anemia, characterized by larger-than-normal red blood cells, may indicate a deficiency in vitamin B12 or folate. Low red blood cell counts combined with specific CBC parameters can prompt your doctor to recommend further testing for these vitamins. Diagnosing these deficiencies early through a CBC can prevent more serious complications like nerve damage or cognitive decline associated with prolonged deficiencies.