Expressnews
Dr. Kirti Chadha, Chief Scientific and Innovation Officer, Metropolis Healthcare Limited
In today’s fast-evolving healthcare landscape, more than 70% of medical decisions are based on laboratory test results. With such a heavy reliance on diagnostics, the accuracy of these results is crucial, and that’s where Internal Quality Control (IQC) comes in. Often overlooked by the public, IQC is a vital behind-the-scenes process that ensures labs deliver dependable, precise results that clinicians can trust.
What is IQC and why does it matter?
IQC is a built-in safety mechanism used by clinical laboratories to monitor and maintain the accuracy and consistency of their testing processes. It works by using special control samples with known outcomes, which are tested alongside patient samples. If the results of these controls match expectations, it means the testing instruments are working properly. If not, it signals an issue that must be addressed before patient results are released.
This system acts as a daily checkpoint, helping labs identify problems early and prevent inaccurate results from leading to misdiagnosis, delayed treatment, or patient harm. Imagine the potential consequences of a faulty blood glucose reading or a missed infection, IQC helps prevent such errors and ensures that patient safety remains a top priority.
Moving beyond traditional quality control:
For years, tools like Levey-Jennings charts and Westgard rules have been used to monitor testing performance, highlighting statistical anomalies that might indicate faulty results. The traditional tools although effective and in use for years, may have some limitations. They may lead to false alarms or, worse, fail to catch subtle but significant errors.
Recognizing these challenges, updated international standards like ISO 15189:2022 and guidance from the International Federation of Clinical Chemistry and Laboratory Medicine (IFCC) now recommend a more nuanced, risk-based approach to IQC focusing quality control efforts on the tests that carry the highest risk to patient outcomes.
Rather than applying the same control rules to every test, labs are encouraged to evaluate the likelihood of error for each test, the potential clinical impact of those errors, and the required precision for accurate diagnosis. By tailoring IQC procedures in this way, labs can detect problems more effectively and prioritize patient safety where it matters most.
The rise of patient-based real-time quality control:
One of the most promising advancements in quality control is Patient-Based Real-Time Quality Control (PBRTQC). Unlike traditional methods that rely on artificial control samples, PBRTQC monitors trends in real patient data to detect abnormalities as they occur. This allows for more sensitive, cost-effective, and continuous monitoring of test performance.
PBRTQC enhances traditional IQC by catching real-world issues that artificial samples may miss. By combining both approaches, labs can create a powerful two-step system to ensure test accuracy and reliability in real time.
Current challenges and the way forward:
Despite the evolution in quality control practices and tools, many laboratories still fall short in implementing IQC effectively. These gaps emphasize the need for improved training, customized IQC procedures, and stronger regulatory oversight to ensure consistency and reliability across labs worldwide. It’s not just about ticking boxes; it’s about building a culture of continuous quality improvement.
Continuous improvement is key:
Effective IQC is not a one-time task. It’s an ongoing, dynamic process that requires constant attention. Laboratories must regularly review control data, identify patterns or shifts, and investigate any abnormalities through thorough root cause analysis. Findings should be documented meticulously, not only to improve internal processes but also to meet accreditation standards and prepare for audits. Good quality control isn’t just about compliance. It’s about ensuring that every test result supports the right diagnosis, enables timely treatment, and protects patient lives.
