Thyroxine - free (FT4)


Loh TPL, Sethi SK and Metz MP, 2015, J Clin Pathol, 68, 642-7 , Paediatric reference and biological variation trends of thyrotropin (TSH) and free thyroxine (T4) in an Asian population


Total Score


Parameter Score
1. Scale A
2. Study Population B
3. Samples B
4. Measurand A
5. Pre-Analytical B
6. Replicate Analysis B
7. Steady State B
8. Outlier Analysis A
9. Normality B
10. Variance Homogeneity C
12. CI C
13. No of Results A
14. Concentrations A
15. Total Score C10,11,12

Item Details

Parameter Score
Matrix Serum
Measurand Thyroxine - free (FT4)
Unit pmol / L
Overall Analytical Principle Method Immunoassay; Competitive
Number of Subjects 1217
Number of Subjects included in BV estimation
Ethinicity Asian
Age Mean / Median
Age Min 0.0
Age Max 20.0
Age SD
Number of Males
Number of Females
State of Well Being
Non-healthy (excl pregnant)
Study Duration Length 7
Study Duration Units Year
Sampling Intervals, e.g. X sample(s) per Interval Unit
Interval Units Day
Sampling Times Start Time:
End Time:
Number of Samples 2
Average Number of Samples Used for BV Estimation
Average Number of Replicates
Estimates of CVi
Calculated Confidence Intervals of CVi Lower: , Upper:
Estimates of CVg
Calculated Confidence Intervals of CVg Lower: 0.00, Upper:
Analytical CV
Calculated Confidence Intervals of Analytical CV Lower: , Upper:
Measurand Mean
Measurand Min
Measurand Max
Measurand SD