| C Reactive Protein | CRP | SST/Serum | 48 hours |
| C Reactive Protein (high sensitivity) | SST/Serum | 48 hours | |
| CA 125 | C125 | SST/Serum | 48 hours |
| CA 15-3 | C153 | SST/Serum | 48 hours |
| CA 19-9 | C199 | SST/Serum | 48 hours |
| CA 72-4 | C724 | SST/Serum | 48 hours |
| Calcium | CA | SST/Serum | 48 hours |
| Calcium (corrected) | CCA | SST/Serum | 48 hours |
| Calcium/Creatinine ratio | CACR | Urine | 48 hours |
| Calprotectin | CALP | Faecal | 48 hours |
| Carcino Embryonic Antigen | CEA | SST/Serum | 48 hours |
| Cardiac Enzymes | CK | SST/Serum | 48 hours |
| Chlamydia | CHLT | Swab/Urine/Tampon | 48 hours |
| Chlamydia/Gonorrhoea | CHNG | Swab/Urine/Tampon | 48 hours |
| Chlamydia/Gonorrhoea/Trichomonas/Genitalium | 4STI | Swab/Urine/Tampon | 48 hours |
| Chloride | CL | SST/Serum | 48 hours |
| Cholesterol | CHOL | SST/Serum | 48 hours |
| Coagulation Profile | COAG | Citrate | 4 hours |
| Conjugated Bilirubin | CBILI | SST/Serum | 48 hours |
| Copper | CU | SST/Serum | 48 hours |
| Covid-19 PCR test | COV | Swab | 48 hours |
| COVID 19 Antibody (Roche) | COVAB | Serum | 48 hours |
| Creatinine | CREA | SST/Serum | 48 hours |