I want to understand relationship between FBS, PPBS, HbA1c. I have some understanding of them, but want to check with others so that I am clear. Below is my understanding -
FBS - Serum Blood Glucose Level during fasting for atleast 10 Hrs
PPBS - Serum Blood Glucose Level after 2 Hrs after eating food (after fasting for atleast 10 Hrs)
HbA1c - Measure of % of how many RBCs having glucose attached to them.
I believe HbA1c value gives average BS level over last 60-120 days (this is because RBCs live for maximum 120 days and after their death, their glycocelated heamoglobin will be broken down and it will not count for ovrall HbA1c levels)
My question is that my latest 2 readings were as below -
Dec 2014 : HbA1c - 6.9
May 2015 : FBS - 90+, PPBS - 120+, HbA1c - 6.4
Aug 2015 : FBS - 96, PPBS - 121, HbA1c - 5.5
Please note that these 2 readings are from different labs.
How on earth my A1c value reduced from 6.4 to 5.5 in just 2.5 months? I am on the same diet and lifestyle from Dec 2014 to Aug 2015. Do last readings seem to be wrong (problem with the lab)??
Please put your valuable opinions on this. Anyway I will get the tests done in the previous lab next month as I have personal constraint to go to that lab (its in far location) this month.