| LG47230-4 | Maprotiline · Pt · Gast fld | 2 |
| LG47247-8 | Meprobamate · Pt · Gast fld | 2 |
| LG47248-6 | Meprobamate · Pt · Ser/Plas | 2 |
| LG47249-4 | Meprobamate · Pt · Urine | 2 |
| LG47265-0 | Methaqualone · Pt · Gast fld | 2 |
| LG47266-8 | Methaqualone · Pt · Ser/Plas | 2 |
| LG47270-0 | Methaqualone · Pt · Urine | 2 |
| LG47272-6 | Methocarbamol · Pt · Ser/Plas | 2 |
| LG47275-9 | Methotrexate · Pt · Ser/Plas | 2 |
| LG47277-5 | Methotrexate · Pt · CSF | 2 |
| LG4728-4 | Protein fractions.oligoclonal bands · Imp · Pt · CSF | 3 |
| LG47282-5 | Methsuximide · Pt · Ser/Plas | 2 |
| LG47283-3 | Methyl ethyl ketone · Pt · Urine | 2 |
| LG47285-8 | Methyl ethyl ketone · Pt · Ser/Plas | 2 |
| LG47286-6 | Methyl ethyl ketone · Pt · Body fld | 2 |
| LG4729-2 | Protein fractions.oligoclonal bands · Imp · Pt · ANYBldSerPl | 3 |
| LG47291-6 | Methylene chloride · Pt · Bld | 3 |
| LG47300-5 | Methylmalonate · Pt · CSF · 118.088 g/mole | 2 |
| LG47301-3 | Methylmalonate · Pt · Ser/Plas · 118.088 g/mole | 2 |
| LG47302-1 | Methylmalonate · Pt · Urine · 118.088 g/mole | 2 |
| LG47303-9 | Methylmalonylcarnitine (C4-DC) · Pt · Ser/Plas | 2 |
| LG47315-3 | Metoprolol · Pt · Ser/Plas | 2 |
| LG4732-6 | Hydrocodone.free · MCnc · Pt · ANYBldSerPl | 2 |
| LG47323-7 | Moclobemide · Pt · Ser/Plas | 2 |
| LG47325-2 | Molybdenum · Pt · Bld | 3 |
| LG47326-0 | Molybdenum · Pt · Urine | 2 |
| LG4733-4 | Hydromorphone.free · MCnc · Pt · ANYBldSerPl | 2 |
| LG47330-2 | Molybdenum · Pt · Ser/Plas | 2 |
| LG4734-2 | 6-Monoacetylmorphine · MCnc · Pt · ANYBldSerPl | 2 |
| LG47340-1 | Nadolol · Pt · Ser/Plas | 2 |
| LG47357-5 | Naproxen · Pt · Ser/Plas | 2 |
| LG47358-3 | Natriuretic peptide.B prohormone N-Terminal · Pt · Ser/Plas | 2 |
| LG47362-5 | Natriuretic peptide.B prohormone N-Terminal · Pt · Ser/Plas · IA | 2 |
| LG47365-8 | Nefazodone · Pt · Ser/Plas | 2 |
| LG47370-8 | N-ethylnicotinamide · Pt · Urine | 2 |
| LG47375-7 | Nicotinamide · Pt · Ser/Plas | 2 |
| LG47377-3 | Nicotine · Pt · Urine | 2 |
| LG47379-9 | Nicotine · Pt · Ser/Plas | 2 |
| LG47389-8 | Norclozapine · Pt · Ser/Plas | 3 |
| LG47396-3 | Norflunitrazepam · Pt · Ser/Plas | 2 |
| LG474-3 | Prostate specific Ag.free · MCnc · Pt · ANYBldSerPl | 2 |
| LG47401-1 | Normephenytoin · Pt · Ser/Plas | 2 |
| LG47407-8 | Norpropoxyphene · Pt · XXX | 2 |
| LG47409-4 | Norpropoxyphene · Pt · Ser/Plas | 2 |
| LG47427-6 | Olanzapine · Pt · Ser/Plas | 2 |
| LG47446-6 | Orotate · Pt · Urine | 2 |
| LG47451-6 | Osteocalcin · Pt · Ser/Plas | 3 |
| LG47454-0 | Oxprenolol · Pt · Ser/Plas | 2 |
| LG47464-9 | Palmitate · Pt · Ser/Plas · 256.43 g/mole | 2 |
| LG4748-2 | Phenylalanine · PrThr · Pt · ANYBldSerPl | 3 |