Final answer:
The diagnosis for a patient with untreated blood pressure readings greater than 140/90 mm Hg is Stage II hypertension, not Stage I, prehypertension, malignant hypertension, or normal blood pressure.
Step-by-step explanation:
If a patient has chronically elevated blood pressure readings greater than 140/90 mm Hg, and is diagnosed but not treated for Stage II hypertension (HTN), the correct diagnosis remains Stage II HTN. It's important to recognize that hypertension often does not cause noticeable symptoms, which is why it is sometimes referred to as the 'silent killer'. Patients with untreated hypertension are at increased risk for serious health issues, such as heart attacks, strokes, and kidney disease.