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Glossary

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f
false negative
test result that indicates that a person does not have a condition when in fact he or she does
false positive
test result that indicates that a person has a condition when in fact he or she does not
fatigue
feeling extremely tired and lacking energy even if a person gets enough sleep; may be accompanied by insomnia or irritability
feces
body waste or byproduct of digestion that is eliminated from the intestines through the anus; also known as poop or shit
fibrosis
formation of scar tissue in the liver in response to damage
fisting
sexual act of inserting the hand into a partner's vagina or anus, for sexual stimulation and pleasure
flagging
drawing some blood into the syringe after inserting the needle to make sure that the needle is in the vein
fluctuating
not remaining at one level; changing over time