QC Series
Quality Control
Practical Quality Control for the Haematology Laboratory
Practical guidance on internal quality control, analytical variation, laboratory troubleshooting, quality-control statistics, and monitoring changes in haematology measurement systems.
Quality Control · QC Series Part 1 · 11 min read
Quality Control in Haematology: What Does a Passing QC Really Tell Us?
Understand what passing internal QC can and cannot prove, including precision, bias, control levels, reagent lot verification and patient-based monitoring in haematology.Quality Control · QC Series Part 2 · 15 min read
Understanding Mean, SD and CV: Reading QC Beyond the Numbers
Learn how mean, standard deviation and CV describe haematology QC performance, with HGB and PLT examples, statistical control limits and practical interpretation.Quality Control · QC Series Part 3 · 21 min read
Reading the Levey–Jennings Chart: When QC Starts Telling a Story
Read Levey–Jennings charts using established mean and SD, a ten-run HGB example, and the distinction between QC patterns and rule-based decisions.Quality Control · QC Series Part 4 · 22 min read
Westgard Rules in Practice: When Should We Stop and Investigate?
Understand Westgard warning and rejection rules, three-level haematology QC, investigation, corrective action and patient-result look-back.Quality Control · QC Series Part 5 · 21 min read
Shift, Trend and Drift in Haematology QC: What Is the Pattern Telling Us?
Recognise HGB shifts, MCV trends and suspected PLT drift; investigate control material, patient evidence and risk before deciding how to respond.Quality Control · QC Series Part 6 · 19 min read
Patient-Based Quality Control in Haematology: What Can a Moving Average Really Tell Us?
Explore patient-based quality control in haematology, Bull's X̄B, moving averages, red-cell indices, patient population effects and practical analytical troubleshooting.Quality Control · QC Series Part 7 · 23 min read
Lot-to-Lot Verification in Haematology: Did the New Reagent Lot Change Patient Results?
Explore reagent lot verification in haematology, patient-sample comparisons, critical differences, detection power, and independent clinical acceptance decisions.Quality Control · QC Series — Part 8 · 19 min read
External Quality Assessment in Haematology: When a Passing Score Is Not Enough
Learn how to interpret haematology EQA and PT results, peer-group agreement, trueness, commutability, and passing scores that still warrant review.Quality Control · QC Series — Part 9 · 19 min read
Method Comparison in Haematology: Why Correlation Is Not Enough
How to interpret correlation, regression, bias and Bland–Altman agreement in haematology method comparisons.Quality Control · QC Series — Part 10 · 19 min read
Analytical Performance Specifications in Haematology: How Much Error Is Acceptable?
How analytical performance specifications connect precision, bias, Milan models and clinical acceptance decisions in haematology.Quality Control · QC Series — Part 11 · 30 min read