There are multiple definitions:

1. fasting blood sugar(English)

   • RBS
   • Diabetes, Clinical chemistry

2. fetal bovine serum(English)

   • Abbreviation may be used in Am. Soc. Physiol. journals without definition.
   • hEG, LIF
   • Physiology
   • https://doi.org…038/cr.2008.130

3. fetal blood sampling(English)

   • DIU
   • Pregnancy, Diagnostics, Monitoring
   • https://pubmed.…ih.gov/3332737/