Free Cortisol Saliva ELISA Kit

  • Created on the 22 February, 2017.


Free cortisol saliva ELISA kit is an accurate in vitro quantitative method for detecting free cortisol in any species using saliva samples. This assay has a minimum sensitivity detection limit of 24.0 pg/ml.


Cortisol that can also be called compound F hydrocortisone is produced in the adrenal cortex within the zona fasciculate or the zona reticularis. Majority of it is found to bound either to cortisol-binding globulins (CBG)(around 90%) or albumin (approx. 7%), whilst only a small fraction between 1-3% is found either as unconjugated or free cortisol. This is the biologically active form of cortisol and it is released in salvia and is then excreted through the kidneys as a relatively small portion among many of the metabolites of cortisol. The amount of free cortisol that is present in blood is responsible for regulating its secretion in the adrenal cortex via a negative feedback mechanism through corticotropin releasing hormone (CRH) within the hypothalamic region and through the ACTH within the pituitary gland.

In humans generally the level of cortisol is found to physiologically fluctuate throughout the day, where the highest concentration are found in the morning and the lowest at midnight. This different levels of fluctuations are accurately reflected in saliva where the highest peak is observed within the first 90 minutes after waking up. Due to the fact that collecting saliva samples is relatively easy and is non-invasive, without putting the patient under any unnecessary stress due to any repeated venipunctures. The determination of cortisol in saliva is highly recommended in patients with abnormal levels of CBG (such as people with hypothyroidism, pregnant women, marked adipositas and nephrotic syndrome). Salivary cortisol ELISA kit is an excellent alternative to LC-MS/MS method, it is simple to perform and provides accurate results that are comparable.


The minimum sensitivity detection limit of free-cortisol using current free cortisol saliva ELISA kit was approximately 24.0 pg/ml. The dynamic range for this assay is 0.1 – 30.0 ng/ml.


  1. Measurement of salivary cortisol in 2012 – laboratory techniques and clinical indications. Clin Endocrinol (Oxf). (2012) 77 (5): 645-51. Review. Inder W.J., et al.
  2. Saliva cortisol–a new approach in noise research to study stress effects. Int J Hyg Environ Health. (2005) 208 (3): 227-30. Review. Bigert C., et al.
  3. Salivary cortisol for assessment of hypothalamic-pituitary-adrenal axis function. Neuroimmunomodulation. (2009) 16 (5): 284-9. Review. Törnhage C.J.
  4. Salivary cortisol in psychobiological research: an overview. Neuropsychobiology. (1989) 22 (3): 150-69. Review. Kirschbaum C. and Hellhammer D.H.


  • Full Name: Free Cortisol Saliva ELISA Kit
  • Reactivity: Any Species
  • Sample Type: Saliva
  • Sensitivity: 0 pg/ml



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