| Test Name (Click to sort by popular result) | COE Code |
| LDL Cholesterol (Direct) | DLDL |
| Lactate, Whole Blood, Adult | |
| Lactate, Whole Blood, Pediatric | |
| Lactic Acid Dehydrogenase Isoenzymes | LD |
| Lactic Acid Dehydrogenase, CSF | LDCSF |
| Lactic Acid Dehydrogenase, Fluid | LDHF |
| Lactic Acid Dehydrogenase, Serum | LDH |
| Lactic Acid, CSF | LACCSF |
| Lactic Acid, Plasma | LACTIC |
| Lamotrigine | LAMOT |
| Lead, Blood | LEAD |
| Lead, Urine | PB-U |
| Legionella Culture | ML MISC |
| Legionella pneumophila Antibody | ML MISC |
| Legionella pneumophila Urine Antigen | LEGA |
| Legionella pneumophilia Antibody, Serotypes 1-14 | SL MISC |
| Leishmania Antibody | ML MISC |
| Leptospira Antibody | LEPTO |
| Leukocyte Alkaline Phosphatase (LAP) Score | ML MISC |
| Levetiracetam, Serum | LEVE |
| Lidocaine | LIDO |
| Limulus Amebocyte Lysate Assay | FLAL |
| Lipase, Fluid | LIPF |
| Lipase, Serum | LIP |
| Lipid Associated Sialic Acid | ML MISC |
| Lipid Survey, Body Fluids | ML MISC |
| Lipoprotein (a) | LPA |
| Lipoprotein Associated Phospholipase A2 | PLAC |
| Lipoprotein Electrophoresis Panel | LIPOEL |
| Lipoprotein Profile | ML MISC |
| Listeria Antibody | ML MISC |
| Lithium | LITH |
| Liver / Kidney Microsomal Antibody | LKM |
| Lorazepam, Serum | ML MISC |
| Lupus Anticoagulant Screen | LA ASSAYS |
| Luteinizing Hormone | LH |
| Lymphocyte Proliferation Antigens | LBANT |
| Lymphocyte Proliferation Mitogens | LBMIT |
| Lysergic Acid Diethylamide (LSD), Urine | ML MISC |
| Lysosomal Enzymes | LYSO |
| Lysozyme (Muramidase), Plasma | MUR |
| Lysozyme (Muramidase), Urine | ML MISC |