| 1018 | Lactate Dehydrogenase |
| 2092 | Lactic Acid, Plasma |
| 91149 | Lamictal |
| 91149 | Lamotrigine |
| 2109 | Lanoxin |
| 91296 | Latex Allergen |
| 1018 | LD |
| 2071 | LD Isoenzymes |
| 1018 | LDH |
| 2032 | LDL Direct |
| 2015 | Lead, Blood [Adult] |
| 2016 | Lead, Blood [Up to 15 yrs] |
| 91306 | Lead, Urine |
| 91252 | Legionella Antibodies, IgG [Types 1-6 by ELISA] |
| 91150 | Legionella Antigen, Urine |
| 91348 | Legionella pneumoniae DFA |
| 91151 | Leptospira Antibody |
| 91152 | Leukemia/Lymphoma Phenotype |
| 2091 | Leukocyte Alkaline Phosphatase |
| 91325 | Levetiracetam |
| 1944 | LFT |
| 2167 | LH |
| 91415 | Lidocaine |
| 2041 | Lipase, Serum or Plasma |
| 1454 | Lipid Panel |
| 2570 | Lipoprotein (a) |
| 91402 | Lipoprotien-Associated Phospholipase |
| 2120 | Lithium |
| 1944 | Liver Function Tests |
| 91153 | Liver-Kidney Microsomal Antibodies |
| 91153 | LKM Antibodies, IgG |
| 91362 | LMW Heparin |
| 2032 | Low Density Lipoprotein |
| 91362 | Low Molecular Weight Heparin |
| 91402 | LP-PLA2 |
| 2121 | Luminal |
| 2637 | Lupus Anticoagulant Panel |
| 1443 | Lupus Panel |
| 2167 | Luteinizing Hormone |
| 2170 | Luteinizing Hormone & Follicle Stimulating Hormone |
| 91156 | Lyme Antibodies, IgG / IgM Western Blot |
| 2330 | Lyme Antibody, Total |
| 91157 | Lysozyme |