UV Light Causes Specific Types of Dark Spots. 1  Melasma: Itâs a common condition characterized by grayish patches on the face, forehead or on the upper lip. 2  Solar Lentigines â Freckles: These are red or brown raised spots caused by long term exposure to the sunlight. 3  Ephelides: These fall under the category of freckles.
What is the antibody titer test? The antibody titer is a test that detects the presence and measures the amount of antibodies within a personâs blood. The amount and diversity of antibodies correlates to the strength of the bodyâs immune response.
The titer corresponds to the highest dilution factor that still yields a positive reading. For example, positive readings in the first 8 serial twofold dilutions translate into a titer of 1:256 (i.e., 2 â8). Titers are sometimes expressed by the denominator only, for example 1:256 is written 256.The term has also two other, conflicting meanings. In titration, the titer is the ratio of actual to nominal concentration of a titrant, e.g. a titer of 0.5 would require 1/0.5 = 2 times more titrant than nominal.0 â8. The titer of a fat is the temperature, in degrees Celsius, at which it solidifies. The higher the titer, the harder the fat. This titer is used in determining whether an animal fat is considered tallow (titer higher than 40 Â°C) or a grease (titer below 40 Â°C).