Prostate specific antigen (PSA) - free


Nixon RG, Wener MH, Smith KM, Parson RE, Blase AB and Brawer MK, 1997, Prost Cancer and Prost diseas, 1, 90-6 , Day to day changes in free and total PSA: significance of biological variation


Total Score


Parameter Score
1. Scale A
2. Study Population A
3. Samples A
4. Measurand A
5. Pre-Analytical A
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 C7,8,10,11,13

Item Details

Parameter Score
Matrix Serum
Measurand Prostate specific antigen (PSA) - free
Unit ng / mL
Overall Analytical Principle Method Immunoassay; Other
Number of Subjects 24
Number of Subjects included in BV estimation 24
Ethinicity Unknown
Age Mean / Median 72.6
Age Min 67.0
Age Max 83.0
Age SD
Number of Males 24
Number of Females 0
State of Well Being
Non-healthy (excl pregnant)
Study Duration Length 2
Study Duration Units Week
Sampling Intervals, e.g. X sample(s) per Interval Unit 1
Interval Units Day
Sampling Times Start Time:
End Time:
Number of Samples 10
Average Number of Samples Used for BV Estimation 10.0
Average Number of Replicates 2.0
Estimates of CVi 12.0
Calculated Confidence Intervals of CVi Lower: 10.87, Upper: 13.35
Estimates of CVg
Calculated Confidence Intervals of CVg Lower: , Upper:
Analytical CV 5.0
Calculated Confidence Intervals of Analytical CV Lower: 4.59, Upper: 5.49
Measurand Mean 1.0
Measurand Min 0.1
Measurand Max 5.8
Measurand SD