"O" test index

Note: Referred tests are marked with an astericks (*)

Test	Specimen Requirements
Occult Blood - chemical test only	Fresh Faeces sample - collection on 3 consecutive days recommended
Occult Blood - immunological assay	As above
Oestradiol (E2) Estradiol / Estrogen	10 mL GEL (white / yellow).
Oligoclonal Bands*	10 mL GEL (white / yellow) + CSF.
Opiates	50ml Random Urine
Organochlorine Pesticides (DDT, Dieldrin)*	10 mL LITHIUM HEPARIN (green). Please provide exposure details.
Organic Acids*	50 mL Random Urine.
Osmolality Serum Urine	10 mL GEL (white / yellow). 50ml Random Urine
Oxalate*	24 hr urine collection into a bottle containing 50ml of 2.4 M HCl
Oxazepam (Serepax)*	10 mL GEL (white / yellow).

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