You don’t need to fast for the Hgb test specifically. You have a medical condition that can affect your Hgb levels.You’ve lost a lot of blood after surgery or a traumatic injury.You don’t have enough iron in your diet.You have parents or other family members who have blood disorders, such as sickle cell anemia.Here are a few other reasons your doctor may order an Hgb test: Abnormal levels of any of these cells can indicate underlying conditions or blood disorders. A CBC test also measures other important components of your blood, such as white blood cells and platelets. The Hgb test may be ordered as part of a complete blood count (CBC) test. If you’re sensitive to getting blood drawn or the sight of blood, have someone come with you and let your provider know. The needle may cause brief discomfort, but the insertion usually lasts less than a minute. The sample is then stored in the tube to be analyzed later at a lab. ![]() To take a sample, your healthcare professional extracts blood from a vein by pricking your finger or inserting a needle with an attached tube into the crease of your arm. The Hgb test uses a sample of your blood to determine hemoglobin levels.
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