| FXIII | Factor 13, Qual w/reflex to Factor 13 1:1 Mix |
| F2A | Factor II Assay (Activity) |
| F2IP | Factor II Inhibitor |
| F9AG | Factor IX Antigen |
| F9A | Factor IX Assay (Activity) |
| F9IP | Factor IX Inhibitor |
| F5I | Factor V (5) Inhibitor |
| LEYDN | Factor V Leiden Mutation |
| FVACT | Factor V, Activity |
| FVR2DNA | Factor V, R2 Mutation DNA Analysis |
| F7I | Factor VII (7) Inhibitor |
| FVAC | Factor VII, Activity |
| F8AG | Factor VIII Antigen |
| F8 | Factor VIII Assay (Activity) |
| F8IB | Factor VIII Inhibitor |
| FXAC | Factor X Assay (Activity) |
| F10CHR | Factor X Chromogenic |
| FAXI | Factor XI Assay (Activity) |
| F12A | Factor XII Assay (Activity) |
| FHPAN | Familial Hypercholesterolemia Panel, Sequencing |
| MEFVS | Familial Mediterranean Fever (MEFV) Sequencing |
| TTRAS | Familial Transthyretin Amyloidosis (TTR) Sequencing |
| FADA | Fanconi Anemia, Group C (FANCC) 2 Mutations |
| FAPCP | Fatty Acid Profile, Comp (C8-C26) |
| ESSFA | Fatty Acid Profile, Essential |
| FAPS | Fatty Acid Profile, Peroxisomal (C22-C26) |
| FFACD | Fatty Acids, Free |
| FEBAB | Febrile Antibody Panel |
| FBLD3 | Fecal Blood, Three Specimens |
| FNAKCL | Fecal Electrolytes, 24 hr. or Random |
| FF24 | Fecal Fat, 24 Hour |
| FATS | Fecal Fat, Random |
| SFF | Fecal Fat, Semi-Quantitative |
| FBLD | Fecal Occult Blood |
| FOBT | Fecal Occult Blood, Colorectal Cancer Screen, Qualitative |
| FRED | Fecal Reducing Substances |
| FELB | Felbamate |
| CDFENT | Fentanyl & Metabolite, UR, Quant |
| FENTU | Fentanyl and Analogues, Urine |
| FNTLM | Fentanyl and Metabolite, Serum |
| FMUQ | Fentanyl and Metabolite, Urine, Quantitative |
| FENURQ | Fentanyl, Urine Screen w/reflex to Quant |
| FERI | Ferritin |
| FIBRN | Fetal Fibronectin |
| KLBT | Fetal Hgb Stain (Kleihauer-Betke) |
| FIB4R | FIB-4 w/reflex to NASH FibroSure® Plus |
| U3RNP | Fibrillarin (U3 RNP) Antibody, IgG |
| FDPP | Fibrin Degradation Products, Plasma |
| FIBRR | Fibrinogen |
| FBRA | Fibrinogen Antigen |
| FIBRO | FibroTest-ActiTest, Serum |
| FANEU | FISH-Aneuploidy Assay (13,18,21,X,Y) Varies |
| FLEC | Flecainide Level, (Tambocor) |
| FLOW | Flow Cytometry (Cell Surf Mark) |
| FLUCON | Fluconazole, Quantitative |
| FLUN | Flunitrazepam and Metabolites (Rohypnol) |
| FLUNU | Flunitrazepam and Metabolites (Rohypnol), Urine |
| FTACSF | Fluorescent Treponema Antibody, CSF |
| FL | Fluoride Quantitative |
| FROC | Fluoroquinolone-Resistant Organism, Culture |
| FLUO | Fluoxetine (Prozac) |
| FLUP | Fluphenazine (Prolixin) |
| LUVX | Fluvoxamine (Luvox) |
| FOL | Folate, Serum |
| AFCOMP | Food Allergens Comprehensive Profile 1 |
| FRGX | Fragile X by PCR |
| TULAR | Francisella tularensis Abs, IgG and IgM |
| FE2 | Free Estradiol by ED/LC-MS/MS |
| HGFP | Free Hemoglobin, Plasma |
| FKLU | Free Kappa/Lambda Light Chain, Quant, Urine |
| FT3E | Free T3 |
| FT4MS | Free T4, Equilibrium Dialysis/Mass Spectrometry |
| FT4 | Free Thyroxine (T4) |
| THYL | Free Thyroxine Index Panel |
| FRU | Fructosamine |
| FSHS | FSH |
| FTA | FTA ABS IgG |
| FABQ | Fungal Antibodies |
| FUNBL | Fungal Culture, Blood |
| FUNID | Fungal ID |
| KOHP | Fungal Stain-KOH w/Calcofluor White |
| FUNGTL | Fungitell (1,3 Beta D Glucan) |
| FUNCU | Fungus Culture |
| FUNDCU | Fungus Culture, Hair/Skin/Nails |
| LSIX | Furosemide (Lasix), Quantitative |
