Clinical Laboratory Hematology 3rd Edition by Shirlyn McKenzie, Lynne Williams

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Nancy, a 28-year-old female, makes an appointment with her physician because she feels tired all the time and is short of breath with minor exertion. She indicates that the symptoms have been ongoing for about 3 weeks. She has no known history of chronic diseases.
Consider the initial laboratory tests that should be performed to evaluate this patient's condition based on clinical history and symptoms.
Nancy's initial complete blood count (CBC) shows a hemoglobin value of 7.0 g/dL and a hematocrit of 21%. Her white blood cell (WBC) count and platelet count are within the reference interval.
What are some reasons for her to have a low hemoglobin value?