The nurse is developing a plan of care for a client with type 2 diabetes mellitus (DM). When providing teaching on lowering blood glucose levels and increasing serum high-density lipoprotein (HDL) levels, which instruction should the nurse include?

A) Incorrect- Anal abscesses and fistulas are more commonly associated with Crohn's disease than with ulcerative colitis. Crohn's disease can involve the entire thickness of the bowel wall and create tunnels or connections (fistulas) between different parts of the gastrointestinal tract.
B) Correct- Rectal bleeding is a common symptom of ulcerative colitis, as the inflamed tissue can bleed easily.
C) Incorrect- Constipation is not a common characteristic of Crohn's disease. In fact, both ulcerative colitis and Crohn's disease can lead to a range of bowel habits, including diarrhea and constipation, depending on the extent and location of inflammation.
D) Incorrect- Both ulcerative colitis and Crohn's disease are inflammatory bowel diseases (IBD) that involve chronic inflammation of the gastrointestinal tract. Ulcerative colitis primarily affects the colon and rectum, causing continuous areas of inflammation and ulceration. Crohn's disease can affect any part of the gastrointestinal tract, from the mouth to the anus. It often involves patches of inflammation with healthy tissue in between, and it can affect different layers of the bowel wall.

A) Incorrect- This test is used to assess for infection or inflammation and is not specifically related to monitoring diabetes insipidus.
B) Incorrect- This test is used to monitor blood sugar levels in individuals with diabetes mellitus, not diabetes insipidus.
C) Incorrect- While urine specific gravity can provide information about urine concentration, it is not the most important laboratory test to monitor in a client with diabetes insipidus. Serum sodium level is a more critical indicator of electrolyte balance and potential complications in DI.
D) Correct- Diabetes insipidus (DI) is a condition characterized by excessive thirst and urination due to the body's inability to regulate fluid balance. In DI, the body either lacks antidiuretic hormone (ADH), which regulates water reabsorption in the kidneys, or the kidneys are resistant to its effects. As a result, clients with DI can produce large volumes of dilute urine. The most significant concern in DI is the potential for electrolyte imbalances, particularly low serum sodium levels (hyponatremia). Excessive loss of water in the urine can lead to dehydration and concentration of the blood's sodium levels. This can result in neurological symptoms, such as confusion, seizures, and even coma. Monitoring the serum sodium level is crucial to ensure that it remains within a safe range.