Can I have a blood test during my period

During menstruation, blood tests can generally be taken for physical examination, but some examination items may be affected by the menstrual cycle. Blood tests during menstruation should be determined based on specific examination items. Routine blood tests, liver function tests, etc. are usually not affected, while tests for sex hormones, coagulation function, etc. may need to be avoided during menstruation. Blood routine examination during menstruation usually does not affect the accuracy of results, and indicators such as red blood cells, white blood cells, and platelets fluctuate less during menstruation. The indicators such as transaminase and bilirubin in liver function tests are also less affected by hormonal changes, and the results of menstrual blood tests have reference value. Thyroid function tests such as thyroid stimulating hormone and free thyroxine can also be completed during menstruation, with limited interference from menstruation on thyroid hormone secretion.

The six tests for sex hormones should consider the specificity of the menstrual cycle. Indicators such as follicle stimulating hormone and luteinizing hormone change significantly with the menstrual cycle, and it is usually recommended to draw blood on the 2nd to 5th day of menstruation. Coagulation function tests may be affected by menstrual prostaglandins, which can shorten the clotting time and increase fibrinogen levels in some women during menstruation. Therefore, menstrual testing should be avoided. Iron metabolism related tests such as serum iron and ferritin may have distorted values due to blood loss during menstruation. It is recommended to have a follow-up examination after the end of menstruation. Before drawing blood during menstruation, it is important to maintain sufficient sleep and avoid vigorous exercise or emotional fluctuations. On the day of blood draw, normal diet is allowed, but it is necessary to inform the doctor that they are currently in their menstrual period. If the examination items include indicators affected by menstruation, the doctor will adjust the testing time according to clinical needs. Menstrual women have relatively weak constitutions, and after drawing blood, they need to press the needle for more than 5 minutes to avoid local bruising. They should also supplement with iron containing foods such as lean meat and animal liver to help with recovery.