[Material for external assessment of quality of glucose analysis]

9,10-bismethyltriphenylphosphoniumanthracene iodide (BPA) in concentrations 1.25-3.75 mmole/liter stabilizes blood serum and preserves glucose in it for 990 days at 4-8 degrees C. For preparing reference material, 200 ml human or animal serum is added to 800 ml 3.125 mM BPA solution, mixed, exposed for 24 h at 4-8 degrees C, centrifuged, the resultant preparation is stored at the same temperature and used as reference material for assessing the quality of glucose measurements by o-toluidine method at biochemical laboratories. The reference material is fit for tests for at least 990 days.