Iron

You should get a serum iron test if you have fatigue, weakness, pale skin, hair loss, brittle nails, or shortness of breath, or if a CBC shows anemia. It is also recommended for pregnant women, people with heavy periods or chronic blood loss, those on iron supplements, and people with suspected iron overload.

Fasting for 8–12 hours is recommended before a serum iron test, and you may drink water during this time. Give your sample in the morning, when iron levels are highest. Avoid iron supplements for at least 24 hours before the test, and inform your doctor about any medicines, recent transfusions, or pregnancy.

Yes, fasting is required for a serum iron test. You should fast for 8–12 hours and preferably give your sample in the morning, though drinking water is allowed. Avoid iron supplements for at least 24 hours beforehand, as recent intake can falsely raise your iron levels.