The continent can be broken into four major landform regions: the Coastal Plains, the Eastern Highlands, the Central Lowlands and the Western Plateau. These landform regions have been created by movements in the Earth's crust, river erosion and changes in climate and sea level.
Causes of Low HGB and Low HCT. Figuring out hematocrit levels in the blood is done through Mean Corpuscular Volume or MCV and Red Cell Distribution Width or RDW. These tests determine whether someone is suffering from low Hgb and/or low HCT levels in their blood and can help doctors determine a cause. 1.Anemia is the direct result of a low red blood cell count.iguring out hematocrit levels in the blood is done through Mean Corpuscular Volume or MCV and Red Cell Distribution Width or RDW. These tests determine whether someone is suffering from low Hgb and/or low HCT levels in their blood and can help doctors determine a cause.
In early pregnancy, one low hCG result is not necessarily a cause for concern; normal hCG levels vary dramatically from person to person. When hCG levels are rising too slowly or dropping over time, however, this could be a symptom of miscarriage or other pregnancy complications. A single low hCG result on a blood test is not enough to diagnose a miscarriage in early pregnancy unless the low hCG level follows an earlier, higher hCG level. 1  Usually, if a doctor believes that a single hCG result is low, the doctor will order another one in two to three days to check the hCG doubling time.