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Related Experiment Videos

Serum cystatin C is sensitive to small changes in thyroid function.

Peter Wiesli1, Beat Schwegler, Giatgen A Spinas

  • 1Department of Internal Medicine, University Hospital of Zurich, CH-8091 Zurich, Switzerland. peter.wiesli@dim.usz.ch

Clinica Chimica Acta; International Journal of Clinical Chemistry
|November 26, 2003
PubMed
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Mild thyroid dysfunction significantly impacts serum cystatin C (CysC) levels, a kidney function marker. Thyroid function must be considered when interpreting CysC results to ensure accurate kidney assessment.

Area of Science:

  • Endocrinology
  • Nephrology
  • Clinical Chemistry

Background:

  • Serum cystatin C (CysC) is recognized as a sensitive marker for assessing kidney function.
  • The influence of subclinical thyroid dysfunction on CysC levels remains largely unexplored.

Purpose of the Study:

  • To investigate the effect of mild thyroid dysfunction, both hypothyroidism and hyperthyroidism, on serum cystatin C levels.
  • To determine if thyroid status influences the utility of CysC as a marker of renal function.

Main Methods:

  • Serum CysC levels were measured in 40 patients at diagnosis of subclinical thyroid dysfunction and after normalization of thyroid-stimulating hormone (TSH).
  • Patients included those with subclinical hypothyroidism (n=26) and subclinical hyperthyroidism (n=14).

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Main Results:

  • In subclinical hypothyroidism, CysC levels increased significantly (p<0.001) from 0.88 mg/l to 1.01 mg/l after treatment.
  • In subclinical hyperthyroidism, CysC levels decreased significantly (p<0.05) from 1.04 mg/l to 0.91 mg/l after achieving euthyroidism.

Conclusions:

  • Mild thyroid dysfunction demonstrably alters serum CysC concentrations.
  • Accurate interpretation of CysC as a kidney function marker necessitates consideration of the patient's thyroid status.