The integrity of i‑STAT cartridges can be verified using 2 of the 3 TriControls, which are control fluids formulated at 3 clinically relevant levels with known concentrations of the test-specific indicators. An analyser will pass or fail this electronic test depending on whether or not it measures these signals within limits specified in the analyser software. This provides an independent check of the analyser's ability to take accurate and sensitive measurements of voltage, current and resistance from the cartridge. The electronic simulator check simulates 2 levels of electrical signals that stress the analyser's cartridge signal detection function both below and above measurement ranges. Using the external electronic simulator adds about 60 seconds to the test cycle. It is inserted into the cartridge port to perform the check. The external electronic simulator is a device in a cartridge form. This adds about 20 seconds to the testing cycle. When the specified time has passed since the last electronic simulator test the internal test will automatically be performed when a cartridge is inserted and before the sample is tested. This is carried out with an electronic simulator (either internal or external), which tests the analyser's cartridge signal‑reading function. The manufacturer's instruction suggests that an electronic quality control check of the performance of each i‑STAT analyser should be done once on each day of use, or as needed. The data can be printed, stored, organised, edited and transferred to a laboratory information system or other computer system such as a hospital information system to aid patient record keeping. The data can be transmitted from multiple analysers in many patient care areas to the i‑STAT Data Manager, a dedicated desktop computer with the i‑STAT central data application installed. Test results are displayed on the LCD screen of the analyser and can be uploaded automatically, either wirelessly with the i‑STAT Wireless or when the analyser is placed in the i‑STAT downloader/recharger. Before running a test, each cartridge initiates a series of pre‑set quality control diagnostics, from monitoring the quality of the sample to validating the reagent. All the tests are run simultaneously and results are available in around 2 minutes for both the CG4+ and CHEM8+ cartridges. The test starts automatically once the cartridge is inserted in the analyser. Two or 3 drops of blood (between 65 and 95 microlitres) are applied to the cartridge using a syringe before the cartridge is inserted into the i‑STAT analyser. To use a test cartridge, the operator and patient information is entered into the i‑STAT analyser using the keypad. The CG4+ cartridge provides the following chemistry test and blood gas measures:ĭetailed information on the cartridges and tests is available on the manufacturer's website, including their intended use, methods and performance data on the tests. This briefing report focuses on 2 i‑STAT cartridges, the CG4+ and CHEM8+, which are most relevant to the NHS ED setting. I‑STAT printer – an optional portable printer which enables the operator to print results at the point of care. I‑STAT data manager – data management software for cartridges, where test records can be transmitted to and then be printed or transmitted to the laboratory/hospital information system. TriControls – a set of control solutions at 3 clinically relevant concentrations of test‑specific indicators for verifying each cartridge type. I‑STAT downloader/recharger – acts as a cradle for the analyser, automatically uploading data (with the non‑wireless analyser) and recharging its batteries.Įlectronic simulator – for checking the performance of the i‑STAT analyser. Cartridges include tests for blood gases, electrolytes, metabolites and coagulation. A large number of cartridges are available to test the most common test‑specific indicators in different combinations. They are inserted into the analyser after the blood sample has been applied. I‑STAT cartridges – single‑use, disposable cartridges for whole‑blood testing. Two versions of the i‑STAT analyser are available: a wireless internet version (the i‑STAT Wireless, which can upload the results wirelessly) and a non‑wireless version (with which test results can be uploaded when the analyser is placed in the i‑STAT downloader/recharger). I‑STAT analyser – a handheld, battery‑operated and fully automated analysis platform, consisting of a LCD screen and keypad.
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