There are multiple definitions:

1. field echo(English)

   • MRI
   • Imaging

2. flexion-extension(English)

   • AA, DOF, EMG, PS
   • Physiology, Physical therapy, Electrophysiology, Myocyte / muscle, Rehabilitation
   • https://doi.org…kin.2010.04.003

3. fractional excretion(English)

   • of sodium (FENa) utilizes urine chemistry to distinguish between different causes of acute kidney injury
   • AKI, FENa
   • Nephrology, Clinical chemistry, Ratio-based metric
   • https://www.sci…retion-fraction

4. finite element(English)

   • FEA
   • Bioengineering, Model(ing)

5. force enhancement(English)

   • Physiology

6. flow-extraction [product](English)

   • may be a surrogate marker for tumor hypoxia in lung cancer, because it reflects the rate of transfer of contrast agent from the intravascular to the extravascular space, from which permeability–surface area product may be derived
   • CT, DCE, NSCLC
   • Biomarker, Oxygen
   • https://doi.org…radiol.12111505

7. field enumeration(English)

   • ABS, CHUM, DU, GQ, NSDUH
   • Surveillance
   • https://www.ncb…ooks/NBK531533/

8. frequent exacerbator(English)

   • refers to a phenotype of chronic obstructive pulmonary disease
   • COPD, CT, NFE
   • Pulmonology, Pathology, Biomarker
   • https://doi.org…47/COPD.S430650

9. fixed effect(English)

   • model for meta-analysis. Allergy is common and may be associated with foods, including cow's milk formula (CMF). Formulas containing hydrolyzed proteins have been used to treat infants with allergy
   • CMF, EHF, PHF
   • Nutrition, Allergy, Pediatrics, Meta-analysis
   • https://doi.org…8.CD003664.pub5