hemoglobin F/HBF blood test

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Hi all, 

Has anyone heard of  the hemoglobin F or HBF blood test? I was sent for one a couple of days ago after having had problems seeing and headaches etc.

My eyes got the all clear but I was sent as I said, for the HBF test. I am Caucasian (so sickle cell does not apply) and quite  a bit older than six months.

All I got off the doctor at the eye hospital was 'there could be something squishing in your brain, go and get these blood tests'