Homeostatic model assessment

Homeostatic Model Assessment (HOMA) is a method used in the field of physiology and medicine to quantify insulin resistance and beta-cell function. It was first described in a 1985 paper by Matthews et al. in the journal Diabetologia.

Overview

The HOMA model is based on the physiological principle of homeostasis, the body's ability to maintain a stable internal environment despite external changes. In the context of glucose metabolism, homeostasis involves a balance between insulin production by the pancreas's beta cells and insulin sensitivity in peripheral tissues.

HOMA uses fasting plasma glucose and insulin concentrations to calculate indices of insulin resistance (HOMA-IR) and beta-cell function (HOMA-β). These indices provide a simple and inexpensive way to assess these key aspects of glucose metabolism, which are often disrupted in conditions such as type 2 diabetes and metabolic syndrome.

Calculation

The original HOMA model calculates HOMA-IR and HOMA-β as follows:

• HOMA-IR = (fasting insulin [μU/mL] × fasting glucose [mmol/L]) / 22.5
• HOMA-β = (20 × fasting insulin [μU/mL]) / (fasting glucose [mmol/L] - 3.5)

These equations assume a normal reference range for fasting insulin of 5-10 μU/mL and for fasting glucose of 3.5-5.5 mmol/L.

Clinical Use

HOMA indices are widely used in both research and clinical settings to assess insulin resistance and beta-cell function. They can help identify individuals at risk of developing type 2 diabetes and monitor the effectiveness of treatments aimed at improving insulin sensitivity or beta-cell function.

However, HOMA is not without limitations. It requires accurate measurement of fasting insulin and glucose, which can be influenced by factors such as diet, physical activity, and stress. Furthermore, it assumes a constant relationship between insulin and glucose, which may not hold true in all individuals or disease states.

See Also

• Insulin resistance
• Beta-cell
• Type 2 diabetes
• Metabolic syndrome

References

• Matthews DR, Hosker JP, Rudenski AS, Naylor BA, Treacher DF, Turner RC. Homeostasis model assessment: insulin resistance and beta-cell function from fasting plasma glucose and insulin concentrations in man. Diabetologia. 1985;28(7):412-419.