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Blood Sciences

Blood Test Information

minimum sample volume required ~ 4ml

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Test Code: ACT

Tube type: EDTA

Special instructions
Needs to be in the laboratory ASAP (within 30 mins). Also send a SST (yellow top) sample for cortisol
Sent away to Bristol Royal Infirmary

Reference range
7.2 - 63.3


Linked to

Turnaround Time
4 days

Department: Biochemistry

Clinical Application
Useful in diagnosis of Addison's disease. A sample for measurement of ACTH should be sent with the basal cortisol of a short synacthen test when this is performed in hospital, prior to commencing steroid cover. ACTH measurement will be undertaken if the short synacthen test is abnormal. Also useful in differentiation of cause of Cushing's syndrome (pituitary, adrenal or ectopic cause), but NOT in making the diagnosis of the syndrome itself (levels can be very low to very high depending on cause).


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