| Rouleaux | LP17684-9 | 1 |
| Rouleaux | Blood | Hematology and Cell counts | LP393420-7 | 1 |
| S-adenosylhomocysteine | Cerebral spinal fluid | Chemistry - non-challenge | LP384323-4 | 1 |
| S-adenosylhomocysteine | Serum or Plasma | Chemistry - non-challenge | LP384324-2 | 1 |
| S-adenosylmethionine | Cerebral spinal fluid | Chemistry - non-challenge | LP384153-5 | 1 |
| S-adenosylmethionine | Serum or Plasma | Chemistry - non-challenge | LP384154-3 | 1 |
| S-beta aminoisobutyrate | Cerebral spinal fluid | Chemistry - non-challenge | LP383767-3 | 1 |
| S-beta aminoisobutyrate | Serum or Plasma | Chemistry - non-challenge | LP383768-1 | 1 |
| Saccharopine | Cerebral spinal fluid | Chemistry - non-challenge | LP384326-7 | 1 |
| Saccharopine | Serum or Plasma | Chemistry - non-challenge | LP384327-5 | 1 |
| Salicylylcarnitine (SalC) | LP70093-7 | 1 |
| Salicylylcarnitine (SalC) | DBS | Chemistry - non-challenge | LP381997-8 | 1 |
| Salmonella and Shigella sp | LP36031-0 | 1 |
| Salmonella and Shigella sp | Stool | Microbiology | LP444541-9 | 1 |
| Salmonella sp | LP16750-9 | 1 |
| SaO2 | Blood | Chemistry - non-challenge | LP383399-5 | 1 |
| SaO2 | Blood capillary | Chemistry - non-challenge | LP383401-9 | 1 |
| SaO2 | Blood central venous | Chemistry - non-challenge | LP426945-4 | 1 |
| SaO2 | Blood cord arterial | Chemistry - non-challenge | LP383403-5 | 1 |
| SaO2 | Blood cord venous | Chemistry - non-challenge | LP383404-3 | 1 |
| SaO2 | Blood venous | Chemistry - non-challenge | LP383406-8 | 1 |
| Sarcosine | Amniotic fluid | Chemistry - non-challenge | LP384329-1 | 1 |
| Sarcosine | Cerebral spinal fluid | Chemistry - non-challenge | LP384330-9 | 1 |
| Sarcosine | Serum or Plasma | Chemistry - non-challenge | LP384331-7 | 1 |
| Saturated fatty acids | Serum or Plasma | Chemistry - non-challenge | LP382063-8 | 1 |
| Schistocytes | LP17715-1 | 1 |
| Schistocytes | Blood | Hematology and Cell counts | LP393421-5 | 1 |
| Sebacate (C8) | LP18453-8 | 1 |
| Sebacate (C8) | Urine | Chemistry - non-challenge | LP382056-2 | 1 |
| Sebacylcarnitine (C10-DC) | LP70098-6 | 1 |
| Sebacylcarnitine (C10-DC) | DBS | Chemistry - non-challenge | LP381777-4 | 1 |
| Second trimester penta maternal screen | LP69854-5 | 1 |
| Second trimester penta maternal screen | Serum or Plasma | Chemistry - non-challenge | LP386788-6 | 1 |
| Second trimester quad maternal screen | LP69852-9 | 1 |
| Second trimester quad maternal screen | Serum or Plasma | Chemistry - non-challenge | LP386787-8 | 1 |
| Selenium | LP14283-3 | 1 |
| Selenium | Serum or Plasma | Drug toxicology | LP388433-7 | 1 |
| Serine | Amniotic fluid | Chemistry - non-challenge | LP384334-1 | 1 |
| Serine | Cerebral spinal fluid | Chemistry - non-challenge | LP384337-4 | 1 |
| Serine | DBS | Chemistry - non-challenge | LP384335-8 | 1 |
| Serine | Serum or Plasma | Chemistry - non-challenge | LP384338-2 | 1 |
| Serotonin | Blood | Chemistry - non-challenge | LP386347-1 | 1 |
| Serotonin | Platelets | Chemistry - non-challenge | LP386349-7 | 1 |
| Serotonin | Serum | Chemistry - non-challenge | LP386350-5 | 1 |
| Severe combined immunodeficiency | DBS | Chemistry - non-challenge | LP385904-0 | 1 |
| Sex hormone binding globulin | LP15863-1 | 1 |
| Sex hormone binding globulin | Serum or Plasma | Chemistry - non-challenge | LP384715-1 | 1 |
| Sexual abstinence duration | LP14756-8 | 1 |
| Sexual abstinence duration | Patient | Fertility testing | LP401021-3 | 1 |
| Sickle cells | LP17228-5 | 1 |
| Sickle cells | Blood | Hematology and Cell counts | LP393424-9 | 1 |
| Sirolimus | LP21368-3 | 1 |
| Sirolimus | Blood | Drug toxicology | LP390593-4 | 1 |
| Sodium | Blood | Chemistry - non-challenge | LP386631-8 | 1 |
| Sodium | Blood arterial | Chemistry - non-challenge | LP386632-6 | 1 |
| Sodium | Blood venous | Chemistry - non-challenge | LP386635-9 | 1 |
| Sodium | Body fluid | Chemistry - non-challenge | LP386636-7 | 1 |
| Sodium | Cerebral spinal fluid | Chemistry - non-challenge | LP386637-5 | 1 |
| Sodium | Dialysis fluid | Chemistry - non-challenge | LP386638-3 | 1 |
| Sodium | Dialysis fluid peritoneal | Chemistry - non-challenge | LP386639-1 | 1 |
| Sodium | Serum or Plasma | Chemistry - non-challenge | LP386648-2 | 1 |
| Sodium | Stool | Chemistry - non-challenge | LP386650-8 | 1 |
| Sodium | Sweat | Chemistry - non-challenge | LP386651-6 | 1 |
| Sodium urate | LP35723-3 | 1 |
| Sodium urate | Urine | Chemistry - non-challenge | LP386723-3 | 1 |
| Sodium urate crystals | Calculus (stone) | Chemistry - non-challenge | LP383593-3 | 1 |
| Somatotropin | Serum or Plasma | Chemistry - non-challenge | LP381398-9 | 1 |
| Specimen drawn | LP29111-9 | 1 |
| Specimen drawn from | LP19464-4 | 1 |
| Specimen drawn from | Patient | Specimen information | LP404264-6 | 1 |
| Specimen volume | Semen | Fertility testing | LP400900-9 | 1 |
| Spermatozoa Agglutinated | LP14770-9 | 1 |
| Spermatozoa Agglutinated | Semen | Fertility testing | LP400950-4 | 1 |
| Spermatozoa Aggregated | LP207805-5 | 1 |
| Spermatozoa Aggregated | Semen | Fertility testing | LP400952-0 | 1 |
| Spermatozoa Immotile | LP14777-4 | 1 |
| Spermatozoa Immotile | Semen | Fertility testing | LP400985-0 | 1 |
| Spermatozoa motility | LP207790-9 | 1 |
| Spermatozoa motility | Semen | Fertility testing | LP400958-7 | 1 |
| Spermatozoa Nonprogressive | LP14783-2 | 1 |
| Spermatozoa Nonprogressive | Semen | Fertility testing | LP400981-9 | 1 |
| Spermatozoa Progressive | LP18589-9 | 1 |
| Spermatozoa Progressive | Semen | Fertility testing | LP400974-4 | 1 |
| Spermatozoa.normal morphology | LP207877-4 | 1 |
| Spermatozoa.normal morphology | Semen | Fertility testing | LP400924-9 | 1 |
| Spherocytes | LP17717-7 | 1 |
| Spherocytes | Blood | Hematology and Cell counts | LP393427-2 | 1 |
| Sphinganine | Serum | Chemistry - non-challenge | LP436910-6 | 1 |
| Sphingosine | LP435679-8 | 1 |
| Sphingosine | Serum | Chemistry - non-challenge | LP436917-1 | 1 |
| Spontaneous clot formation | LP222222-4 | 1 |
| Spontaneous clot formation | Platelet poor plasma | Coagulation | LP393996-6 | 1 |
| Squalene | LP200440-8 | 1 |
| Squalene | Serum or Plasma | Chemistry - non-challenge | LP382497-8 | 1 |
| Staphylococcus aureus | LP16662-6 | 1 |
| Staphylococcus sp | LP19642-5 | 1 |
| Starch granules | LP15867-2 | 1 |
| Starch granules | Urine sediment | Urinalysis | LP402522-9 | 1 |
| Stationary clot growth | LP222223-2 | 1 |
| Stationary clot growth | Platelet poor plasma | Coagulation | LP393999-0 | 1 |