Gestational diabetes is: (Select All that Apply.)

Choice A reason: Type 1 diabetes is characterized by an absolute deficiency of insulin due to autoimmune destruction of pancreatic beta cells. It is not primarily marked by insulin resistance, which is more characteristic of type 2 diabetes. The genetic and environmental factors in type 1 diabetes lead to a lack of insulin production, rather than resistance.

Choice B reason: In type 1 diabetes, there is an absolute deficit in insulin production. This is because the body's immune system attacks and destroys the insulin-producing beta cells in the pancreas. As a result, individuals with type 1 diabetes require exogenous insulin to manage their blood glucose levels.

Choice C reason: While type 1 diabetes has genetic and environmental influences, the condition results in an inability to produce insulin rather than partial insulin production. The autoimmune response in type 1 diabetes leads to the destruction of almost all beta cells, resulting in an absolute deficit of insulin.

Choice D reason: Type 1 diabetes does not typically exhibit both insulin resistance and no insulin production. While some individuals with type 1 diabetes may develop insulin resistance over time (a condition known as "double diabetes"), the hallmark feature of type 1 diabetes is the absolute deficiency of insulin due to the autoimmune destruction of beta cells.

Choice A reason: CA125, also known as Cancer Antigen 125, is a protein that is often elevated in ovarian cancer. It is used as a tumor marker to monitor treatment response and detect recurrence in patients with ovarian cancer. While CA125 can also be elevated in other conditions, it is most commonly associated with ovarian cancer and is a valuable tool in the management of this disease.

Choice B reason: H&H levels refer to hemoglobin and hematocrit levels, which are measures of red blood cells in the blood. While these levels can provide important information about a patient's overall health and can be affected by various conditions, they are not specific tumor markers used to detect or monitor cancer.

Choice C reason: Vitamin D levels are important for bone health and overall well-being, but they are not used as tumor markers. Vitamin D deficiency or excess can have various health implications, but it does not provide specific information about the presence or progression of cancer.

Choice D reason: Amylase levels are enzymes that help digest carbohydrates. Elevated amylase levels can indicate pancreatic issues, such as pancreatitis, but they are not used as tumor markers for cancer detection or monitoring. Amylase levels are more relevant to gastrointestinal and pancreatic health rather than oncology.