| L. rhamnosus/L. jensenii/L. crispatus/L. gasseri oral supplement | Lactobacillus rhamnosus/L. jensenii/L. crispatus/L. gasseri oral supplement |
| L19-IL2 | bifikafusp alfa |
| LAK | lymphokine-activated killer cells |
| L-AMB | liposomal amphotericin B |
| LAPd | alpha-lipoic acid-palladium/vitamin/mineral supplement |
| LAPS-GCSF | eflapegrastim |
| L-ASP | asparaginase |
| L-ATRA | liposomal tretinoin |
| LCH | Langerhans cell histiocytosis |
| LCIS | lobular carcinoma in situ |
| LCLT | L-carnitine L-tartrate |
| LC-MS | liquid chromatography-mass spectrometry |
| LD | linkage disequilibrium |
| LDCT | low-dose computed tomography; low-dose CT scan |
| LDE225 | erismodegib; Odomzo; sonidegib phosphate |
| LDH | lactate dehydrogenase; lactic acid dehydrogenase |
| LE-DT | liposomal docetaxel |
| LEEP | loop electrosurgical excision procedure; loop excision |
| LEP-ETU | liposomal paclitaxel; LipoTaxen; paclitaxel liposome |
| LEUP | leuprolide acetate |
| LEV | levamisole hydrochloride |
| L-FMAU | clevudine |
| LFS | Li-Fraumeni syndrome |
| LGD1069 | bexarotene; Targretin |
| L-Grb-2 | liposome-incorporated Grb2 antisense oligodeoxynucleotide |
| LH | interstitial cell-stimulating hormone; luteinizing hormone; lutropin |
| LH-RH | gonadotropin-releasing hormone; luteinizing hormone-releasing hormone |
| LHRH | gonadotropin-releasing hormone; luteinizing hormone-releasing hormone |
| LIN | lobular intraepithelial neoplasia; lobular neoplasia |
| LITT | laser interstitial thermal therapy |
| LLME | L-leucyl-L-leucine methyl ester |
| LMB-1 | LMB-1 immunotoxin |
| LMB-2 | LMB-2 immunotoxin |
| LMH | honey-based nutritional supplement |
| LMP2A CTL | LMP2a-specific cytotoxic T-lymphocytes |
| L-MTP-PE | mifamurtide; muramyl tripeptide phosphatidylethanolamine |
| LMTX | lometrexol |
| L-NDDP | liposomal NDDP |
| LNG-IUS | levonorgestrel-releasing intrauterine system |
| L-NNA | NG-nitro-L-arginine |
| LOE | Lindera obtusiloba extract |
| LOH | loss of heterozygosity |
| L-OHP | oxaliplatin |
| LOXO-101 | larotrectinib sulfate; Trk inhibitor LOXO-101; Vitrakvi |
| LP | lumbar puncture; spinal tap |
| Lp 299v | Lactobacillus plantarum strain 299v |
| L-PAM | melphalan |
| LPHL | nodular lymphocyte-predominant Hodgkin lymphoma |
| LPS | lipopolysaccharide |
| LPV7 | long peptide vaccine 7 |
| LSIL | low-grade squamous intraepithelial lesion |
| LVA | lymphaticovenous anastomosis; lymphovenous bypass |
| LVB | lymphaticovenous anastomosis; lymphovenous bypass |
| LY231514 | Alimta; pemetrexed disodium; Pemfexy |
| LY317615 | enzastaurin hydrochloride |
| LY335979 | zosuquidar trihydrochloride |
| LYCO | lycopene |