Measurement uncertainty calculator template
A qc sheet in the Measurement Uncertainty procedure (PR22), mapped to ISO 15189:2022 clause 7.3.4. Fill it in whenever the task occurs. Used by the laboratory team.
Qc sheetISO 15189 · 7.3.4As needed
Calculated automaticallyRed = outside limits
Your LaboratoryMeasurement uncertainty calculator | YL-LAB-FRM-22-T01 v1.0
Record: Measurement uncertainty calculator — October 2026
u(Rw) = long-term IQC CV % (at least 6 months, same level as the decision point). u(bias) = √(bias%² + u(ref)%²), optional. u_c = √(u(Rw)² + u(bias)²); expanded U = k × u_c (k = 2, about 95 %). Compare U with your maximum allowable uncertainty (MAU). Approach as described in ISO/TS 20914; confirm your laboratory's chosen model.
| No. | Analyte (units) | IQC level | Concentration | u(Rw) CV % | Bias % | u(ref) % | u_c % | k | U % | U (units) | MAU % | Meets MAU? |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Haematology | 4.92 | 91.50 | 94.30 | 95 | 162.14 | 0.00 | 0.000 | 97 | Yes | ||
| 2 | Chemistry | 5 | 87.70 | 95.80 | 96.50 | 161.81 | 0.00 | 0.000 | 86.10 | Yes | ||
| 3 | Microbiology | 5.11 | 86.50 | 97.90 | 92.70 | 160.19 | 0.00 | 0.000 | 97.70 | Yes | ||
| 4 | Reception | 4.92 | 95.10 | 94.20 | 97.30 | 165.48 | 0.00 | 0.000 | 86.20 | Yes | ||
| 5 | Haematology | 4.92 | 93.70 | 92.30 | 97.40 | 163.66 | 0.00 | 0.000 | 87.70 | Yes | ||
| 6 | Chemistry | 4.90 | 92.10 | 90.20 | 93.40 | 159.19 | 0.00 | 0.000 | 89.50 | Yes | ||
| 7 | Microbiology | 4.99 | 94 | 89.20 | 90 | 157.77 | 0.00 | 0.000 | 92.50 | Yes | ||
| 8 | Reception | 4.97 | 87.60 | 87.70 | 90 | 153.18 | 0.00 | 0.000 | 88.70 | Yes |
Sign-off
| Role | Name | Signature | Date |
|---|---|---|---|
| Completed by | |||
| Reviewed by |
Shaded cells are calculated automatically. Values in red are outside their limits. † marks a corrected value (see Corrections).
Controlled document. Printed copies are uncontrolled unless stamped.Page 1
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What it records
- Analyte (units)
- IQC level
- Concentration
- u(Rw) CV %
- Bias %
- u(ref) %
- u_c %
- k
- U %
- U (units)
- MAU %
- Meets MAU?
Instructions on the form
- u(Rw) = long-term IQC CV % (at least 6 months, same level as the decision point). u(bias) = √(bias%² + u(ref)%²), optional. u_c = √(u(Rw)² + u(bias)²); expanded U = k × u_c (k = 2, about 95 %). Compare U with your maximum allowable uncertainty (MAU). Approach as described in ISO/TS 20914; confirm your laboratory's chosen model.
Sign-off
- Completed by
- Reviewed by
Related templates
Clause references are to ISO 15189:2022; check them against your licensed copy of the standard.