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| TEST | SAMPLE TYPE | REPORT TIME |
| OCCULT BLOOD | STOOLS | FROM 2 TO 24 HOURS |
| OESTRADIOL | SERUM | FROM 2 TO 24 HOURS |
| OESTRIOL | SERUM | FROM 2 TO 5 DAYS |
| OSMOLALITY | SERUM | FROM 2 TO 5 DAYS |
| OSMOLALITY (URINE) | URINE RANDOM | FROM 2 TO 5 DAYS |
| OSTEOCALCIN (OSTEOPOROSIS) | SERUM | FROM 2 TO 24 HOURS |
| OVARIAN ANTIBODIES | SERUM | FROM 2 TO 5 DAYS |
| OXALATES (URINE 24 HRS) | URINE 24 HRS WITH PRESERVATIVE | FROM 2 TO 5 DAYS |