If you have a hemoglobin variant, such as sickle cell hemoglobin (hemoglobin S), you will have a decreased amount of hemoglobin A. This may limit the usefulness of the A1c test in monitoring your diabetes. If you have anemia, hemolysis, or heavy bleeding, your test results may be falsely low.
Who was the president that believed that a US-controlled canal across Central America was a vital strategic interest to America and so was largely responsible for construction of the Panama Canal? Theodore Roosevelt
John F. Wallace was the first Chief Engineer of the Panama Canal, during the U.S. construction period. Wallace directed all the works until 1905, when he was replaced by John F. Stevens.