An FBS (fasting blood sugar) measurement is the most convenient test after overnight fasting. […] You have diabetes if your FBS is 126 mg/dl or more. But confirm it once more the next day or any other day. If the next time also FBS is more than 126 mg/dl then definitely you have diabetes. 2008, Manthappa M., How to Manage Your Diabetes and Lead a Normal Life, New Delhi: Peacock Books, →ISBN, page 10:
(abbreviation, alt-of, countable, initialism, uncountable) Initialism of fetal bovine serum.
Even more, cross-cousins on the mother's side (MBS and MBD) are called by different terms – the same as for M and MB, respectively – than those on the father's side (FBS and FBD). Finally, FB is called by the same term as F,[…] 2009 June 24, Jack David Eller, Cultural Anthropology: Global Forces, Local Lives, Routledge, →ISBN, page 196:
(abbreviation, alt-of, countable, initialism, uncountable) Initialism of failed back syndrome.