Lacher DA, Hughes JP and Carroll MD, 2010, Natl Health Stat Report , 21, , Biological variation of laboratory analytes based on the 1999–2002 National Health and Nutrition Examination Survey


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 B
8. Outlier Analysis A
9. Normality B
10. Variance Homogeneity C
12. CI A
13. No of Results A
14. Concentrations A
15. Total Score C10

Item Details

Parameter Score
Matrix Serum
Measurand Potassium
Unit mmol / L
Overall Analytical Principle Method Unknown
Number of Subjects 823
Number of Subjects included in BV estimation 823
Ethinicity Hispanic or Latino
Age Mean / Median
Age Min 16.0
Age Max 69.0
Age SD
Number of Males
Number of Females
State of Well Being
Healthy (excl pregnant)
Study Duration Length 1
Study Duration Units Week
Sampling Intervals, e.g. X sample(s) per Interval Unit 1
Interval Units Week
Sampling Times Start Time:
End Time:
Number of Samples 2
Average Number of Samples Used for BV Estimation 2.0
Average Number of Replicates 1.0
Estimates of CVi 5.5
Calculated Confidence Intervals of CVi Lower: 5.23, Upper: 5.80
Estimates of CVg 8.1
Calculated Confidence Intervals of CVg Lower: 7.62, Upper: 8.62
Analytical CV 1.5
Calculated Confidence Intervals of Analytical CV Lower: 1.35, Upper: 1.68
Measurand Mean 4.09
Measurand Min
Measurand Max
Measurand SD