By the way, doctor. What does it mean if my fasting blood sugar level is high (135-145) but my glycosylated hemoglobin test is negative?

@article{Keating2006ByTW,
  title={By the way, doctor. What does it mean if my fasting blood sugar level is high (135-145) but my glycosylated hemoglobin test is negative?},
  author={Nancy L. Keating},
  journal={Harvard health letter},
  year={2006},
  volume={31 9},
  pages={8}
}