A cheap and portable blood test could provide a breakthrough for diagnosing infections in remote areas of the world, a scientific study says. The mChip is about the size of a credit card and can diagnose infections within minutes, according to a study in the journal Nature Medicine. Prototype tests for diseases such as HIV and syphilis in Rwanda showed almost 100% accuracy, it said. The US-developed device has a projected cost of $1 (60p). This would make it much cheaper than the lab-based tests currently used. The plastic chip contains 10 detection zones, and can test for multiple diseases with only a pinprick of blood. Results can be seen with the naked eye or with a low-cost detector. "The idea is to make a large class of diagnostic tests accessible to patients in any setting in the world, rather than forcing them to go to a clinic to draw blood and then wait days for their results," said Samuel Sia, a professor at New York's Columbia University who is a lead developer of the device. Hundreds of tests using a prototype of the device were carried out in Kigali, Rwanda. They showed 95% accuracy for HIV and 76% accuracy for syphilis, the study says. Researchers hope to use the mChip to help increase testing of sexually-transmitted diseases (STDs) in pregnant women, particularly in Africa. A version of the device has also been designed to test for prostate cancer. Source: BBC