Urea

Reference

Reference
Hölzel WGE, 1987, Clin Chem, 33, 670-3 , Intra-individual variation of some analytes in serum of patients with chronic renal failure

Scoring

Total Score

C8,13

Parameter Score
1. Scale A
2. Study Population A
3. Samples A
4. Measurand A
5. Pre-Analytical A
6. Replicate Analysis A
7. Steady State A
8. Outlier Analysis C
9. Normality A
10. Variance Homogeneity A
11. ANOVA B
12. CI A
13. No of Results C
14. Concentrations A
15. Total Score C8,13
Comment

Item Details

Parameter Score
Matrix Serum
Measurand Urea
Unit mmol / L
Overall Analytical Principle Method Spectrophotometry; UV/VISIBLE
Number of Subjects 17
Number of Subjects included in BV estimation 17
Ethinicity Caucasian
Age Mean / Median
Age Min
Age Max
Age SD
Number of Males 8
Number of Females 9
State of Well Being
Non-healthy (excl pregnant)
Diseases
Study Duration Length 12
Study Duration Units Week
Sampling Intervals, e.g. X sample(s) per Interval Unit
Interval Units Other
Sampling Times Start Time: 06.30
End Time: 08.00
Number of Samples 8
Average Number of Samples Used for BV Estimation 8.0
Average Number of Replicates
Estimates of CVi 11.7
Calculated Confidence Intervals of CVi Lower: 10.27, Upper: 13.48
Estimates of CVg
Calculated Confidence Intervals of CVg Lower: , Upper:
Analytical CV 2.6
Calculated Confidence Intervals of Analytical CV Lower: 1.88, Upper: 4.19
Measurand Mean 21.1
Measurand Min
Measurand Max
Measurand SD

Coding