77937-1
LaboratoryCortisol [Moles/volume] in Serum or Plasma --12 hours post XXX challenge
Definition
Timed cortisol levels are obtained for adrenocorticotropic hormone challenge tests to assist in diagnosing adrenocortical insufficiency as found in Cushing's syndrome and Addison's disease. There are different types of challenges. ACTH (adrenocorticotropic hormone) stimulation, where cosyntropin (a synthetic form of ACTH) is given, and then blood is sampled for cortisol levels before the bolus, and at specified times after the bolus. The ACTH stimulation directly evaluates adrenal gland function and indirectly evaluates pituitary gland and hypothalamus function. Cortisol levels rise significantly after administration of cosyntropin if the adrenal glands are functioning normally. For the CRH (corticotropin-releasing hormone) stimulation, CRH is given and cortisol and ACTH levels are determined before the injection, at the injection time, and specified times following injection. The CRH stimulation test is used to distinguish Cushings disease from conditions where ACTH is secreted ectopically. For the Dexamethasone suppression (overnight) test (DST), dexamethasone (Decadron) is given and samples for cortisol levels are collected the following morning. The DST differentiates the causes of increased cortisol levels. For the Metyrapone (overnight) stimulation challenge, metyrapone is given with a snack at midnight. Samples for cortisol, 11-deoxycortisol, and ACTH are collected the following morning. The metyrapone stimulation test distinguishes corticotropin-dependent causes (pituitary Cushing's disease and ectopic Cushing's disease) from corticotropin-independent causes (carcinoma of the lung or thyroid) of increased cortisol levels.
LOINC 6-Axis Classification
Component
Cortisol^12H post XXX challenge
Property
SCnc
Time Aspect
Pt
System
Ser/Plas
Scale Type
Qn
Method Type
N/A
Details
Class
CHAL
Order/Observation
Observation
Short Name
Cortis 12h p chal SerPl-sCnc
Display Name
Cortisol 12 Hr post Unsp challenge [Moles/Vol]
Related Names
Frequently Asked Questions
What is LOINC code 77937-1?
LOINC code 77937-1 identifies "Cortisol [Moles/volume] in Serum or Plasma --12 hours post XXX challenge". Timed cortisol levels are obtained for adrenocorticotropic hormone challenge tests to assist in diagnosing adrenocortical insufficiency as found in Cushing's syndrome and Addison's disease. There are different types of challenges. ACTH (adrenocorticotropic hormone) stimulation, where cosyntropin (a synthetic form of ACTH) is given, and then blood is sampled for cortisol levels before the bolus, and at specified times after the bolus. The ACTH stimulation directly evaluates adrenal gland function and indirectly evaluates pituitary gland and hypothalamus function. Cortisol levels rise significantly after administration of cosyntropin if the adrenal glands are functioning normally. For the CRH (corticotropin-releasing hormone) stimulation, CRH is given and cortisol and ACTH levels are determined before the injection, at the injection time, and specified times following injection. The CRH stimulation test is used to distinguish Cushings disease from conditions where ACTH is secreted ectopically. For the Dexamethasone suppression (overnight) test (DST), dexamethasone (Decadron) is given and samples for cortisol levels are collected the following morning. The DST differentiates the causes of increased cortisol levels. For the Metyrapone (overnight) stimulation challenge, metyrapone is given with a snack at midnight. Samples for cortisol, 11-deoxycortisol, and ACTH are collected the following morning. The metyrapone stimulation test distinguishes corticotropin-dependent causes (pituitary Cushing's disease and ectopic Cushing's disease) from corticotropin-independent causes (carcinoma of the lung or thyroid) of increased cortisol levels.
What does 77937-1 measure?
This code measures Cortisol^12H post XXX challenge in Ser/Plas. It belongs to the CHAL class in the LOINC classification.
What is LOINC?
LOINC (Logical Observation Identifiers Names and Codes) is a universal standard for identifying laboratory and clinical observations. It is maintained by the Regenstrief Institute and used worldwide for health data exchange.