recent eating habits; test results can be affected by eating large amounts of iron-rich foods shortly before the blood test
Patients scheduled for an iron level, TIBC, or transferrin test should fast for 12 hours before the blood is drawn. They are allowed to drink water. Patients scheduled for a ferritin test do not need to fast but they should not have any alcoholic beverages before the test.
Aftercare consists of routine care of the area around the venipuncture.
The primary risk is the possibility of a bruise or swelling in the area of the venipuncture. The patient can apply moist warm compresses if there is any discomfort.