Final answer:
The symptoms described are indicative of diabetic ketoacidosis (DKA), a life-threatening condition caused by a severe deficiency of insulin. Intravenous fluids and insulin should be administered to correct the electrolyte imbalances and normalize blood sugar levels.
Step-by-step explanation:
The symptoms described in the question are indicative of a hyperglycemic crisis, specifically diabetic ketoacidosis (DKA). This is a life-threatening condition that occurs when there is a severe deficiency of insulin in the body, leading to increased blood sugar levels. The weight loss, polyphagia, polydipsia, and polyuria are all symptoms of uncontrolled diabetes.
The low bicarbonate (HCO3) and high glucose levels (436) seen in the lab results further support the diagnosis of DKA. The next best step would be to administer intravenous fluids and insulin to correct the electrolyte imbalances, normalize blood sugar levels, and rehydrate the patient. Additionally, the underlying cause of the DKA, such as infection or missed insulin doses, should be addressed and treated.