A1C test may be less accurate for black people

[CHawkins]

http://www.npr.org/sections/health-shots/2017/02/07/513891129/the-a1c-blood-sugar-test-may-be-less-accurate-in-african-americans

[richard]

Interesting.

HbA1c is subject to individual variability, because it’s a marker of how glycated red blood cells get over their life … and we all have different lifespans for our erythrocytes.

But yes I would expect that sickle cell anaemia would drastically affect the glycation rate and the lifespan of cells.