Djurhuus MS, Gram J, Hyltoft Petersen P, Klitgaar d NAH, Bollerslev J Beck-Nielsen H, 1995, Scand J Clin Lab Invest, 55, 549-58 , Biological variation of serum and urinary magnesium in apparently healthy males


Total Score


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 B
8. Outlier Analysis B
9. Normality A
10. Variance Homogeneity A
12. CI A
13. No of Results A
14. Concentrations A
15. Total Score B7,8

Item Details

Parameter Score
Matrix Serum
Measurand Magnesium
Unit mmol / L
Overall Analytical Principle Method Spectrophotometry; Atomic absorption
Number of Subjects 60
Number of Subjects included in BV estimation 59
Ethinicity Unknown
Age Mean / Median 31.0
Age Min 20.0
Age Max 54.0
Age SD
Number of Males 60
Number of Females 0
State of Well Being
Healthy (excl pregnant)
Study Duration Length 3
Study Duration Units Month
Sampling Intervals, e.g. X sample(s) per Interval Unit 3
Interval Units Week
Sampling Times Start Time: 6.00
End Time: 7.00
Number of Samples 3
Average Number of Samples Used for BV Estimation 3.0
Average Number of Replicates 1.0
Estimates of CVi 3.2
Calculated Confidence Intervals of CVi Lower: 2.83, Upper: 3.68
Estimates of CVg 7.4
Calculated Confidence Intervals of CVg Lower: 6.19, Upper: 9.12
Analytical CV 0.5
Calculated Confidence Intervals of Analytical CV Lower: 0.38, Upper: 0.75
Measurand Mean 0.87
Measurand Min
Measurand Max
Measurand SD