Intra-day variability of cystatin C, creatinine and estimated GFR in intensive care patients.

2016-09-01

Ravn, Bo

Larsson, Anders

Mårtensson, Johan

Martling, Claes-Roland

Bell, Max

Creatinine

Critical illness

Cystatin C

Renal markers

Journal Article

0000-0001-8739-7896

10.1016/j.cca.2016.06.014

Markers of renal function are widely used in intensive care and sudden changes are important indicators of acute kidney injury. The problem is to distinguish between disease progression/improvement from the natural variation in the patient. The aim of the present study was thus to study the normal intraday variation in ICU patients. We studied the intra-day variation of creatinine, cystatin C and estimated GFR based on these two markers in 28 clinically stable ICU patients. The median diurnal coefficient of variation sCV) for creatinine was 3.70% (1.92-9.25%) while the median CV for cystatin C was 3.66% (1.36-8.11%). The corresponding CVs for the estimated GFRs were 2.00% (0.89-9.82%) for eGFRcreatinine and 4.60% (1.65-10.24%) for eGFRcystc. The eGFRcreatinine values in individual patients were clearly higher than the eGFRcystc values. The median CV for creatinine, cystatin C and the eGFR measurements were below 5% which means that 95% of the test results will vary by <10% between sampling times in stable ICU patients. Differences >10% between sampling times are thus likely to be an indication of changes in biomarker levels due to the disease/treatment.

link

Clinica chimica acta; international journal of clinical chemistry 2016; 460: 1-4

Clinica chimica acta; international journal of clinical chemistry