The relationship between estimated glomerular filtration rate and thyroid function: an observational study.

Area of Science:

• Nephrology
• Endocrinology
• Clinical Chemistry

Background:

• Estimated glomerular filtration rate (eGFR) is routinely reported by laboratories.
• Thyroid dysfunction is a commonly overlooked factor affecting eGFR interpretation.
• Accurate GFR assessment is vital for patient management.

Purpose of the Study:

• To investigate the impact of thyroid dysfunction on eGFR.
• To determine if hypothyroidism and hyperthyroidism alter measured eGFR values.

Main Methods:

• Retrieved serum creatinine data for hypothyroid, hyperthyroid, and euthyroid patients.
• Calculated eGFR using the simplified Modification of Diet in Renal Disease Study equation.
• Compared median eGFR values across the three patient groups.

Main Results:

• Median eGFR was significantly lower in hypothyroid patients (64 mL/min/1.73 m²).
• Median eGFR was higher in hyperthyroid patients (107 mL/min/1.73 m²).
• Euthyroid patients had a median eGFR of 77 mL/min/1.73 m², with all groups showing significant differences (P < 0.001).

Conclusions:

• Thyroid dysfunction is strongly associated with significant alterations in eGFR.
• Clinical interpretation of eGFR must consider thyroid status for accuracy.
• Further research may explore the mechanisms behind these observed eGFR changes.