| LACO | Lacosamide (Vimpat), Serum | — |
| LACTC | Lactic Acid, CSF | — |
| LCTFL | Lactoferrin, Fecal | — |
| LTT | Lactose Tolerance | Enzymatic Hexokinase Method |
| LAMO | Lamotrigine (Lamictal) | — |
| BFLD | LD, Body Fluid | Electrochemiluminescence Immunoassay |
| LD | LDH | Electrochemiluminescence Immunoassay |
| LDIS | LDH (Lactate Dehydrogenase) Isoenzymes | — |
| YCLD | LDH (Lactate Dehydrogenase) Total, CSF | — |
| LDLR | LDL Cholesterol (Direct) | — |
| PBU | Lead, 24-Hour Urine | — |
| LEDCAP | Lead, Capillary | — |
| LEADBS | Lead, Filter Paper Blood Spot | — |
| PBRU | Lead, Random Urine | — |
| LEAD | Lead, Venous | — |
| PBIEP | Lead, ZPP, Industrial Exposure Panel, Adult | — |
| LEFLUM | Leflunomide Metabolite, Serum or Plasma | — |
| LGCU | Legionella Culture | — |
| LEGMA | Legionella pneumophila Antibodies (Types 1-6) IgG, IgM, IgA | — |
| LEAG | Legionella pneumophila Antigen, Urine | — |
| LEGDF | Legionella pneumophila DFA | — |
| LSQPCR | Legionella Species by Qualitative PCR | — |
| LEMON | Lemon IgE | — |
| LENTIL | Lentil IgE | — |
| LPTI | Leptin, Serum | — |
| LEPA | Leptospira Antibody, IgM by Dot Blot | — |
| LETTCE | Lettuce IgE | — |
| LCMS | Leukemia/Lymphoma Immuno by Flow | — |
| LTE4 | Leukotriene E4, 24 Hr., Urine | — |
| LXPO | Lexapro (Escitalopram), Serum | — |
| LBRM | Librium and Nordiazepam | — |
| LPAS | Lipase | Colorimetric Enzymatic Method |
| LIPEA | Lipid Panel, Extended (Non-HDL) | — |
| LIPM | Lipid Profile M | Please see individual components for methodology |
| LIPD | Lipid Profile, Basic (Lipid Profile plus Glucose) | Please see individual components for methodology |
| LIPOP | LipoFit by NMR, Particle Count Only | — |
| LPPA | Lipoprotein (a) | — |
| LI | Lithium | Colorimetric Method |
| LCAT1 | Liver Cytosolic Antigen Type 1 (LC-1) Antibody, IgG | — |
| FLFFTA | Liver Fibrosis Panel | — |
| FIBROHV | Liver Fibrosis, Chronic Viral Hepatitis (FibroMeter) | — |
| LIV2 | Liver Profile 2 (Liver Profile plus GGT) | Please see individual components for methodology |
| LIVB | Liver Profile Basic | Please see individual components for methodology |
| LKM1 | Liver-Kidney Microsome 1 Ab, IgG by ELISA | — |
| LKMA | Liver-Kidney Microsome Antibody, IgG by IFA | — |
| LOBSTR | Lobster IgE | — |
| LORA | Lorazepam (Ativan) | — |
| LPA2 | Lp-PLA2, Lipoprotein-Assoc. Phospholipase A2, Activity (PLAC) | — |
| LRP4 | LRP4 Autoantibody Test | — |
| LARP | Lupus Anticoagulant Reflex Panel | — |
| LACCP | Lupus Anticoagulant/Cardiolipin ABS panel | LUPP-Instrumentation Laboratory ACL Top 750; ACABP-Multiplex Flow Immunoassay; BET2-Semi-Quantitative Enzyme-Linked Immunosorbent Assay |
| LUPP | Lupus Panel | — |
| LHS | Luteinizing Hormone | Electrochemiluminescence Immunoassay |
| LYMCRPS | Lyme (Borrelia burgdorferi) Abs, Total, CSF | — |
| WBLC | Lyme (Borrelia burgdorferi) IgG/IgM Western Blot CSF | — |
| LNBAB | Lyme CNS IgG a/Ab Index Reflex | — |
| LTAR | Lyme Dis Abs w/ref to W. Blot | — |
| LYMPCR | Lyme Disease (Borrelia Species) by PCR, Blood | — |
| BTICK | Lyme Disease (Borrelia Species) by PCR, Tick | — |
| LDSS | Lyme Disease Serology, Serum | — |
| PBORB | Lyme Disease, Molecular Detection, PCR, Blood | — |
| LAMPP | Lymphocyte Antigen & Mitogen Proliferation Panel | — |
| MITGEN | Lymphocyte Proliferation | — |
| LSP2 | Lymphocyte Subset Panel 2 - CD4 % and Absolute | — |
| LSP5 | Lymphocyte Subset Panel 5 - Total Lymphocyte Enumeration | — |
| LSP6 | Lymphocyte Subset Panel 6 - Total Lymphocyte Enumeration w/CD45RA & CD45RO | — |
| LSNGS | Lynch Syndrome Panel, Sequencing and Deletion/Duplication | — |
| LYSO | Lysozyme, Serum | — |
