Yes, one can get a HBA1c done on empty stomach or post meals.
No it is not harmful.The doctor will advise you blood donation after testing your blood. If you do not have any blood related disorders such as hemophillia you can donate blood to your loved ones in case of emergency.
If your hemoglobin in 7.4 then, your skin may start to look pale, you will experience short of breathe and minor cuts will start to bleed longer than usual. It is advisable not to let anemia worsen and seek help from a medical professional at the earliest.
No, research suggests that chronic use of hemoglobin will increase HbA1C levels falsely. Hence, you are advised to take aspirin only if you have been advised by a doctor.
In males, a healthy hemoglobin level is between 13.2 and 16.6 grams per deciliter of blood (g/dL). In females, a hemoglobin count of between 11.6 and 15 g/dL is considered normal and healthy. 17.4 is slightly on the higher side you must consult a doctor specially if you are feeling tired and bruising easily.