Preferred Sample Type

Adrenocorticotrophic Hormone (ACTH)

Suitable Specimen Types

  • EDTA Plasma
  • Special Collection Procedures Apply
1 mL blood (2 x paed EDTA tubes)

Specimen Transport

Send frozen to referral laboratory weekly

Sample Processing in Laboratory

Blood sample must reach the laboratory within 30 minutes (and preferably have been taken onto ice)

Sample Preparation

NOTE TIME WHEN SPECIMEN WAS TAKEN.

Centrifuge within 30 mins, using cold buckets.

Transfer plasma to a labelled plastic tube.

If visible haemolysis is present, discuss the suitability of the sample with the duty biochemist.

Turnaround Time

14 days

Sample Stability

Store plasma immediately at -20oC

Adrenocorticotrophic Hormone (ACTH)

General Information

Adrenocorticotropic hormone (ACTH) is produced in the pituitary gland to stimulate secretion of cortisol by the adrenal glands. Normally, ACTH increases when cortisol is low and falls when cortisol is high. The concentration of ACTH varies greatly at different times of the day, with the highest amount at about 8 am and the lowest about midnight, therefore the sample will normally be collected first thing in the morning.

Secretion of ACTH may be increased by stress.

Some drugs and conditions can cause ACTH levels to rise, including amphetamines, insulin, levodopa, and metoclopramide.

Drugs that cause ACTH to fall include dexamethasone and other drugs that act like cortisol (including prednisone, hydrocortisone, prednisolone, and methylprednisolone), and megestrol acetate.

Ectopic tumours may secrete fragments or big ACTH which are biologically active but undetected by the assay.

Cross reactivity with synacthen is <= 1%

Patient Preparation

Ensure patient is not taking corticosteroids, synacthen and avoid undue stress. Please state time of collection. Lithium heparin interferes with the assay. Take blood into EDTA tubes and send to the lab immediately on ice.

Notes

To diagnose adrenal and pituitary diseases such as Cushing's syndrome, Cushing's disease, Addison's disease, adrenal tumors, and pituitary tumors; usually done as a diagnostic test once an abnormal cortisol level is detected.

Reference Range

7.2 - 63.3 ng/L (7-10am)

Source of Reference Range

Provided by referral laboratory

Specifications

  • EQA Scheme?: Yes
  • EQA Status:

    Laboratory participates in the NEQAS scheme

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The Trust Laboratories at Heartlands Hospital, Good Hope Hospital and Solihull Hospital were awarded UKAS (United Kingdom Accreditation Service) accreditation to the internationally recognised ISO 15189 standard in May 2015. For a list of accredited tests and other information please visit the test database http://www.heftpathology.com/frontpage/test-database.html.
Tests not appearing on this scope are either under consideration or in the process of accreditation and so currently remain outside of our scope of accreditation. However, these tests have been validated to the same high standard as accredited tests and are performed by the same trained and competent staff.

For further information contact Louise Fallon, Quality Manager, 0121 424 1235

UKAS HEFT