Skip to content
flowss
Start freeChecking your session
Plot templates

Levey-Jennings chart — glucose QC with a 2-2s rejection

Levey-Jennings internal quality control chart for a clinical chemistry analyte: twenty daily QC results plotted against an assigned mean and cumulative SD with +/-1s, +/-2s and +/-3s limits, showing the 1-2s warning at run 14 and the 2-2s systematic-error rejection completed at run 15 — the chart a medical laboratory scientist reviews and signs before releasing any patient result.

PlotLife SciencesPlot syntax docs
Template previewPlot
Levey-Jennings chart - serum glucose QC Level 2 (hexokinase, Cobas c503)8 series (line). x from 0 to 21 — QC run. y from 7.6 to 8.8 — Glucose. Series: QC result; Mean 8.20; +2s 8.56; -2s 7.84; +3s 8.74; -3s 7.66; +1s 8.38; -1s 8.02.Levey-Jennings chart - serum glucose QC Level 2 (hexokinase, Cobas c503)Assigned mean 8.20 mmol/L, SD 0.18 (20-day baseline), CV 2.2% · 8 series · 34 pointsQC resultQC result: 1, 8.22QC result: 2, 8.14QC result: 3, 8.27QC result: 4, 8.09QC result: 5, 8.31QC result: 6, 8.18QC result: 7, 8.25QC result: 8, 8.05QC result: 9, 8.21QC result: 10, 8.33QC result: 11, 8.12QC result: 12, 8.28QC result: 13, 8.16QC result: 14, 8.59QC result: 15, 8.62QC result: 16, 8.24QC result: 17, 8.19QC result: 18, 8.3QC result: 19, 8.11QC result: 20, 8.26Mean 8.20+2s 8.56-2s 7.84+3s 8.74-3s 7.66+1s 8.38-1s 8.0205101520QC run (one per day, consecutive)7.67.888.28.48.68.8Glucose (mmol/L)QC resultMean 8.20+2s 8.56-2s 7.84+3s 8.74-3s 7.66+1s 8.38-1s 8.02Control material lot 41827. Westgard multirule applied as 1-3s / 2-2s / R-4s / 4-1s / 10x. Run 14 at +2.17s is a 1-2s WARNING only. Run 15 at +2.33s makes twoconsecutive results beyond +2s on the same side: 2-2s, so run 15 is REJECTED - systematic error, recalibrate and repeat QC before any patient result from that run isreleased. No 1-3s, R-4s, 4-1s or 10x violation is present in these 20 runs.

Make it your own.

title: Levey-Jennings chart - serum glucose QC Level 2 (hexokinase, Cobas c503)
subtitle: Assigned mean 8.20 mmol/L, SD 0.18 (20-day baseline), CV 2.2%
x: QC run (one per day, consecutive)
y: Glucose (mmol/L)
x limits: 0 .. 21
y limits: 7.60 .. 8.80
grid: y
legend: right
caption: Control material lot 41827. Westgard multirule applied as 1-3s / 2-2s / R-4s / 4-1s / 10x. Run 14 at +2.17s is a 1-2s WARNING only. Run 15 at +2.33s makes two consecutive results beyond +2s on the same side: 2-2s, so run 15 is REJECTED - systematic error, recalibrate and repeat QC before any patient result from that run is released. No 1-3s, R-4s, 4-1s or 10x violation is present in these 20 runs.

line "QC result" colour: blue markers: yes
    1, 8.22
    2, 8.14
    3, 8.27
    4, 8.09
    5, 8.31
    6, 8.18
    7, 8.25
    8, 8.05
    9, 8.21
    10, 8.33
    11, 8.12
    12, 8.28
    13, 8.16
    14, 8.59
    15, 8.62
    16, 8.24
    17, 8.19
    18, 8.30
    19, 8.11
    20, 8.26

line "Mean 8.20" colour: black
    0, 8.20
    21, 8.20

line "+2s 8.56" colour: amber dash: yes
    0, 8.56
    21, 8.56

line "-2s 7.84" colour: amber dash: yes
    0, 7.84
    21, 7.84

line "+3s 8.74" colour: red
    0, 8.74
    21, 8.74

line "-3s 7.66" colour: red
    0, 7.66
    21, 7.66

line "+1s 8.38" colour: grey dash: yes
    0, 8.38
    21, 8.38

line "-1s 8.02" colour: grey dash: yes
    0, 8.02
    21, 8.02