| LDL cholestrol |
| LDL/HDL |
| Lithium |
| LDH |
| Lipase |
| Lipoprotein a |
| Plasma Lactate |
| CSF lactate |
| Lamotrigin |
| Lymphocyte |
| Lymphocytes Variant Form (LVF) |
| Large Platelets |
| LE cell |
| Leishman Body |
| LKM Ab |
| Lupus anticoagulant(screening): |
| Leptospira Ab(IgG) |
| Leptospira Ab(IgM) |
| Listeria Ab (IgG) |
| Listeria Ab (IgM) |
| Borrelia Burgdorferi Ab (IgG) |
| Borrelia Burgdorferi Ab (IgM) |
| Borrelia Burgdorferi Ab-IgG(CSF) |
| Borrelia Burgdorferi Ab-IgM(CSF) |
| LH |
| Leptin |
| . Lymphocyte |
| . LDH |
| . Liquefaction |
| . Long tail |
| LSD |
| LDL cholestrol |
| Lactoferrin(stool) |
| Lorazepam |
| LBC-slide |
| levcin-rich glioma-inactivated protein1 |
| Lipocalin |
| LDL oxidative |
| LCAT |
| LUC |
| Lupus anticoagulant(confirmatory): |
| Lynch syn.(MMR screen) |
| LA Mix |
| Legionella pneumophila Ab (IgG) |
| Legionella pneumophila Ab (IgM) |
| Listeria Monocytogenes |