Prostate specific antigen (PSA) - free


Bruun L, Becker Ch et al, 2005, Prostate, 65, 216-21 , Assessment of intra-individual variation in prostate-specific antigen levels in a biennal randomized prostate càncer screening program in Sweden


Total Score


Parameter Score
1. Scale A
2. Study Population A
3. Samples B
4. Measurand A
5. Pre-Analytical B
6. Replicate Analysis B
7. Steady State C
8. Outlier Analysis C
9. Normality A
10. Variance Homogeneity C
12. CI A
13. No of Results C
14. Concentrations A
15. Total Score C7,8,10,13

Item Details

Parameter Score
Matrix Serum
Measurand Prostate specific antigen (PSA) - free
Unit ng / mL
Overall Analytical Principle Method Immunoassay; Time-resolved immunofluorometric assay (TR-IMFA)
Number of Subjects 791
Number of Subjects included in BV estimation 791
Ethinicity Unknown
Age Mean / Median
Age Min
Age Max
Age SD
Number of Males 791
Number of Females 0
State of Well Being
Healthy (excl pregnant)
Study Duration Length 8
Study Duration Units Year
Sampling Intervals, e.g. X sample(s) per Interval Unit 2
Interval Units Year
Sampling Times Start Time:
End Time:
Number of Samples 5
Average Number of Samples Used for BV Estimation 5.0
Average Number of Replicates 1.0
Estimates of CVi 9.7
Calculated Confidence Intervals of CVi Lower: 0.00, Upper: 15.10
Estimates of CVg
Calculated Confidence Intervals of CVg Lower: , Upper:
Analytical CV 7.2
Calculated Confidence Intervals of Analytical CV Lower: 6.73, Upper: 7.74
Measurand Mean 0.15
Measurand Min 0.11
Measurand Max 0.19
Measurand SD