Human skin color is determined by the interaction of melanin, carotene and hemoglobin. Storage of water, fat, glucose and vitamin D is also a function of the integumentary system, according to the AAD.
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Results are usually available in one to two weeks. NIPT has been found to be 92 to 99 percent accurate in detecting these conditions. These tests claim that they allow women to find out whether their baby has one of these conditions without subjecting themselves to an invasive procedure such as amniocentesis or CVS.