| Lf dose | The limes flocculation dose of diphtheria toxin, i.e., the smallest amount of toxin that, when mixed with one unit of antitoxin, yields the most rapid flocculation in the Ramon test (in vitro); in general, the Lf dose is slightly less than the Lr dose. (05 Mar 2000) |
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| LFA | <abbreviation> Left frontoanterior position; lymphocyte function associated antigen. (05 Mar 2000) |
| LFP | <abbreviation> Left frontoposterior position. (05 Mar 2000) |
| LFT | <abbreviation> Left frontotransverse position. (05 Mar 2000) |