Chignon (hairstyle) Chignon (hairstyle) A chignon (; ) is a popular type of hairstyle. The word "chignon" comes from the French phrase "chignon du cou", which means nape of the neck. Chignons are generally achieved by pinning the hair into a knot at the nape of the neck or at the back of the head, but there are many different variations of the style. They are usually secured with accessories such as barrettes or hairpins. Chignons are frequently worn for special occasions, like weddings and formal dances, but the basic chignon is also worn for everyday casual wear. The chignon can be
BUN-to-creatinine ratio BUN-to-creatinine ratio In medicine, the BUN-to-creatinine ratio is the ratio of two serum laboratory values, the blood urea nitrogen (BUN) (mg/dL) and serum creatinine (Cr) (mg/dL). Outside the United States, particularly in Canada and Europe, the truncated term urea is used (though it is still the same blood chemical) and the units are different (mmol/L). The units of creatinine are also different (μmol/L), and this value is termed the urea-to-creatinine ratio. The ratio may be used to determine the cause of acute kidney injury or dehydration. The principle behind this ratio is the fact that both urea (BUN) and creatinine