Utility of Point-of-Care Creatinine devices in screening for chronic kidney disease- A community-based service evaluation study

The kidneys act as the body's internal filtration system, constantly cleaning the blood by removing waste and excess fluid. When these organs begin to fail, a condition known as chronic kidney disease, the damage often happens silently. In the early stages, a person may feel perfectly fine, unaware that their kidneys are struggling. The standard way to detect this trouble is by measuring a waste product called creatinine in the blood. High levels of creatinine suggest the kidneys are not filtering efficiently. However, in many parts of the world, particularly in resource-limited settings, getting this test done is difficult. It usually requires a visit to a hospital, a trained technician, a machine that needs electricity, and a wait for results that can take days. By the time a diagnosis is made, the disease may have already progressed to a severe stage.

In a community in Freetown, Sierra Leone, researchers set out to see if a simpler, faster method could change this reality. They tested a small, handheld device that measures creatinine from a tiny drop of blood taken from a fingertip, similar to how people with diabetes check their sugar levels. The goal was to determine if this portable tool could accurately screen for kidney disease in a community setting, offering a quick answer where a laboratory test is often out of reach. The study focused on adults living in Government Wharf, an urban area where many residents work in fishing, trade, and informal sectors. The team wanted to know if this device could find the disease early enough to help people get care before it was too late.

The researchers gathered 261 adults from the community, dividing them into groups based on their health history. Some participants had known risk factors like high blood pressure or diabetes, while others did not. On a single day, the team collected two types of blood samples from each person. First, they used a finger-prick to draw a small amount of blood for the handheld device. Immediately after, they took a larger sample from a vein in the arm to send to a standard laboratory. The laboratory used a conventional method to measure creatinine, which served as the benchmark for accuracy. The researchers also checked urine samples for signs of protein, another marker of kidney stress, and calculated a score that estimates how well the kidneys are working.

The results revealed a significant health challenge within the community. Using the handheld device, the team found that 13 percent of the participants showed signs of chronic kidney disease. This means that roughly one in eight people in this group had kidneys that were not functioning at full capacity. The most common risk factor identified among these individuals was systemic hypertension, or high blood pressure. This finding aligns with broader patterns seen in the region, where high blood pressure is a leading cause of kidney strain. The study also noted that many participants had high levels of protein in their urine, further confirming that kidney damage was present, even if the individuals had not felt sick.

When the researchers compared the results from the handheld device to the laboratory results, they found a very strong agreement in the trends. The numbers from the two methods moved together consistently, meaning that when the lab showed a high level, the handheld device also showed a high level. However, there was a small, consistent difference. The handheld device tended to give a slightly lower number than the laboratory test. On average, the device underestimated the creatinine level by about 0.2 milligrams per deciliter. While this difference is measurable, the researchers found that the device was still highly effective at spotting the people who needed help. It correctly identified every single person who had a low kidney function score, showing a perfect ability to catch those with the most significant issues.

The study suggests that despite the slight underestimation, this portable tool is a powerful asset for community health. In a place where access to a full laboratory is limited, the ability to get an immediate result from a finger prick is a major advantage. The device allows health workers to quickly identify individuals with elevated creatinine levels and refer them for further care without delay. The researchers noted that factors like the hot tropical climate or differences in hydration might contribute to the small gap between the device and the lab, but these factors did not stop the device from doing its job. The study concludes that this technology offers a practical way to screen for kidney disease early, potentially saving lives by catching the problem before it becomes critical.

The authors acknowledge that their findings come from a specific community and a relatively small group of people, so the results might look different in other regions or with larger populations. They also noted that the laboratory method they used to compare against has its own limitations, which could slightly skew the numbers. Nevertheless, the core message remains clear: a simple, portable device can bridge the gap between a community and the care they need. By making screening accessible and immediate, such tools can help uncover hidden cases of kidney disease, allowing for earlier intervention and better health outcomes for people who might otherwise go undiagnosed.