Is there such a thing?
If yes, any reputable brands?
I dont like to go to the doctor. They are always patronising to people with thalassemia minor.
If there isnt such a thing ,I also found a device called pulse oximeter. It measures the levels of oxygen in your blood (if I am correct). Could this be used to indirectly measure if fetal hemoglobin is increased when taking supplements like wheat grass and resveratol?