The open vial stability claim on Verichem Laboratories’ combined Ammonia/Iron Standard Kit extends to 24 months when stored at 2°C to 8°C, making this liquid-stable, ready-to-use product ideal for numerous calibration verification events or test system troubleshooting. The five-level kit comes with an optional and stand-alone sixth level, comprising a set of standards containing concentration levels of iron from 10 mcg/dL to 1000 mcg/dL and 10 mcg/dL to 2000 mcg/dL for ammonia. Intended for the calibration or calibration verification of both ammonia and iron assays employing either enzymatic or colorimetric, wet chemistry testing methodologies, its liquid stable format is free of glycols, surfactants, azides, and other interfering substances. The aqueous matrix is designed to support these trace analytes, while offering exceptional lot-to-lot duplication and product performance claims. All kit materials are filled inside 15 mL translucent, polyethylene dropper vials, and prepared from reagent grade source materials.