FDM vs. FDMA. Frequency Division Multiplexing, or FDM, is a multiplexing technique for the physical layer that allows multiple low bandwidth signals to share the same high bandwidth frequency range.It is achieved by allocating a smaller frequency range to each signal that is using the same channel.ummary: 1. FDM is a physical layer multiplexing technique, while FDMA is a data link layer access method. 2. Using FDM to allow multiple users to utilize the same bandwidth is called FDMA.
Often, the first test used to diagnose anemia is a complete blood count (CBC). The CBC measures many parts of your blood. This test checks your hemoglobin and hematocrit (hee-MAT-oh-crit) levels. Hemoglobin is an iron-rich protein in red blood cells that carries oxygen to the body. Hematocrit is a measure of how much space red blood cells take up in your blood. A low level of hemoglobin or hematocrit is a sign of anemia. The normal range of these levels varies in certain racial and ethnic populations.
Iron studies are requested in two main situations; the investigation of the cause of anaemia and when iron excess is suspected. This term refers to the presence of too few red blood cells, which are needed to carry oxygen to the body. Many conditions can cause anaemia, but iron deficiency is one of the most common.