| Monocytes+Macrophages | Pleural fluid | Hematology and Cell counts | LP393026-2 | 2 |
| Monocytes+Macrophages | Synovial fluid | Hematology and Cell counts | LP393027-0 | 2 |
| Mononuclear cells | Body fluid | Hematology and Cell counts | LP393131-0 | 2 |
| Mononuclear cells | Cerebral spinal fluid | Hematology and Cell counts | LP393133-6 | 2 |
| Mononuclear cells | Peritoneal fluid | Hematology and Cell counts | LP393136-9 | 2 |
| Mononuclear cells | Pleural fluid | Hematology and Cell counts | LP393137-7 | 2 |
| Mononuclear cells | Synovial fluid | Hematology and Cell counts | LP393138-5 | 2 |
| Morphine | LP15174-3 | 2 |
| Morphine | Urine | Drug toxicology | LP390032-3 | 2 |
| Mucus | Urine | Urinalysis | LP402519-5 | 2 |
| Mycobacterium sp | LP18667-3 | 2 |
| Mycoplasma sp | LP14264-3 | 2 |
| Myeloblasts | LP15076-0 | 2 |
| Myeloblasts | Blood | Hematology and Cell counts | LP392837-3 | 2 |
| Myelocytes | Blood | Hematology and Cell counts | LP392841-5 | 2 |
| Myelocytes | Body fluid | Hematology and Cell counts | LP392842-3 | 2 |
| Myelocytes | Cerebral spinal fluid | Hematology and Cell counts | LP392843-1 | 2 |
| Myoglobin | Urine | Chemistry - non-challenge | LP382622-1 | 2 |
| Myristate (C14:0) | LP33065-1 | 2 |
| N-Acetylgalactosamine-4-Sulfatase | LP14031-6 | 2 |
| N-carbamoyl beta alanine | LP99937-2 | 2 |
| N-Nervonoylsphingosine | LP412215-8 | 2 |
| N-Nervonoylsphingosine | Plasma | Chemistry - non-challenge | LP416998-5 | 2 |
| N-Palmitoylsphingosine | LP412214-1 | 2 |
| N-Palmitoylsphingosine | Plasma | Chemistry - non-challenge | LP416999-3 | 2 |
| N-Stearoylsphingosine | LP412213-3 | 2 |
| N-Stearoylsphingosine | Plasma | Chemistry - non-challenge | LP417000-9 | 2 |
| Natriuretic peptide B | LP28609-3 | 2 |
| Neisseria gonorrhoeae | Cervix | Microbiology | LP375498-5 | 2 |
| Nervonate (C24:1) | LP33074-3 | 2 |
| Neural tube defect risk | LP62865-8 | 2 |
| Neutrophil.fMLP stimulated.DHR | LP247787-7 | 2 |
| Neutrophil.fMLP stimulated.DHR mean fluorescence intensity | LP247790-1 | 2 |
| Neutrophil.PMA stimulated.DHR mean fluorescence instensity | LP247786-9 | 2 |
| Neutrophils | Blood cord | Hematology and Cell counts | LP392642-7 | 2 |
| Neutrophils | Body fluid | Hematology and Cell counts | LP392643-5 | 2 |
| Neutrophils | Cerebral spinal fluid | Hematology and Cell counts | LP392644-3 | 2 |
| Neutrophils | Peritoneal fluid | Hematology and Cell counts | LP392647-6 | 2 |
| Neutrophils | Pleural fluid | Hematology and Cell counts | LP392648-4 | 2 |
| Neutrophils | Synovial fluid | Hematology and Cell counts | LP392651-8 | 2 |
| Neutrophils | Vitreous fluid | Hematology and Cell counts | LP392652-6 | 2 |
| Nonhematic cells | Body fluid | Hematology and Cell counts | LP393465-2 | 2 |
| Nonhematic cells | Cerebral spinal fluid | Hematology and Cell counts | LP393466-0 | 2 |
| Nordiazepam | Urine | Drug toxicology | LP391863-0 | 2 |
| Norepinephrine | Plasma | Chemistry - non-challenge | LP381221-3 | 2 |
| Normoblasts | LP21238-8 | 2 |
| Normoblasts | Blood cord | Hematology and Cell counts | LP392566-8 | 2 |
| Normocytic | LP17680-7 | 2 |
| Normocytic | Blood | Hematology and Cell counts | LP393439-7 | 2 |
| Nucleated erythrocytes | Blood | Hematology and Cell counts | LP392558-5 | 2 |
| Nucleotide repeats | LP193279-9 | 2 |
| Octadecanoate (C18:0) | LP19175-6 | 2 |
| Octanoate (C8:0) | LP18448-8 | 2 |
| Octenoylcarnitine (C8:1) | LP19312-5 | 2 |
| Oleate (C18:1w9) | LP15751-8 | 2 |
| Oleoylcarnitine (C18:1) | LP19328-1 | 2 |
| Omega 6 fatty acids (w6) | Serum or Plasma | Chemistry - non-challenge | LP382131-3 | 2 |
| Opiates | Meconium | Drug toxicology | LP390079-4 | 2 |
| Organic acidemias | LP56747-6 | 2 |
| Organic acids | LP14888-9 | 2 |
| Organic acids pattern | LP30850-9 | 2 |
| Osmotic fragility | Control | Hematology and Cell counts | LP393819-0 | 2 |
| Osmotic fragility | Control | Red Blood Cells | Hematology and Cell counts | LP393818-2 | 2 |
| Other cells | Blood | Hematology and Cell counts | LP393304-3 | 2 |
| Ova and parasites | Stool | Microbiology | LP442162-6 | 2 |
| Oxazepam | LP16227-8 | 2 |
| Oxazepam | Urine | Drug toxicology | LP391878-8 | 2 |
| OXcarbazepine | LP20805-5 | 2 |
| Oxygen | Blood | Chemistry - non-challenge | LP383360-7 | 2 |
| Oxygen | Blood arterial | Chemistry - non-challenge | LP383361-5 | 2 |
| Oxygen | Blood capillary | Chemistry - non-challenge | LP383362-3 | 2 |
| Oxygen | Blood central venous | Chemistry - non-challenge | LP426943-9 | 2 |
| Oxygen | Blood cord arterial | Chemistry - non-challenge | LP383364-9 | 2 |
| Oxygen | Blood cord venous | Chemistry - non-challenge | LP383365-6 | 2 |
| Oxygen | Blood mixed venous | Chemistry - non-challenge | LP383366-4 | 2 |
| Oxygen | Blood venous | Chemistry - non-challenge | LP383367-2 | 2 |
| Oxygen content | Blood arterial | Chemistry - non-challenge | LP383374-8 | 2 |
| Oxyhemoglobin | LP15766-6 | 2 |
| oxyMORphone | LP15176-8 | 2 |
| oxyMORphone | Urine | Drug toxicology | LP390128-9 | 2 |
| Palatinase | LP18576-6 | 2 |
| Palmitate (C16:0) | LP15768-2 | 2 |
| Palmitoleate (C16:1w7) | LP33069-3 | 2 |
| Palmitoleylcarnitine (C16:1) | LP29060-8 | 2 |
| Palmitoylcarnitine (C16) | LP19325-7 | 2 |
| Parathyrin.intact | LP15778-1 | 2 |
| Pathology | LP7839-6 | 2 |
| Pentacarboxylporphyrin I | Urine | Chemistry - non-challenge | LP411809-9 | 2 |
| Pentacarboxylporphyrin III | Urine | Chemistry - non-challenge | LP411810-7 | 2 |
| Pentacarboxylporphyrins | Serum or Plasma | Chemistry - non-challenge | LP386493-3 | 2 |
| Pentacarboxylporphyrins | Urine | Chemistry - non-challenge | LP386495-8 | 2 |
| Pentanoic acids | LP31726-0 | 2 |
| pH | Blood | Chemistry - non-challenge | LP383431-6 | 2 |
| pH | Blood arterial | Chemistry - non-challenge | LP383432-4 | 2 |
| pH | Blood capillary | Chemistry - non-challenge | LP383433-2 | 2 |
| pH | Blood central venous | Chemistry - non-challenge | LP426948-8 | 2 |
| pH | Blood cord arterial | Chemistry - non-challenge | LP383435-7 | 2 |
| pH | Blood cord venous | Chemistry - non-challenge | LP383436-5 | 2 |
| pH | Blood mixed venous | Chemistry - non-challenge | LP383437-3 | 2 |
| pH | Blood venous | Chemistry - non-challenge | LP383438-1 | 2 |