Final answer:
The nurse should administer 2 units of Humulin R insulin subcutaneously, as the patient's blood glucose level is 129 mg/dL, which falls within the 101-150 mg/dL range on the sliding scale provided.
Step-by-step explanation:
The client's Accucheck reading at 6 AM was 129 mg/dL. Referring to the sliding scale for insulin dosage provided, the correct action by the nurse would be to administer 2 units of Humulin R insulin subcutaneously. This is because the blood glucose (BG) level falls within the range of 101-150 mg/dL on the sliding scale, which corresponds to a dosage of 2 units of Humulin R.
According to the guidelines provided, there is no need to call the healthcare provider for BG levels below 300 mg/dL, nor is it indicated to use NPH insulin or administer D50, which is a form of glucose used to rapidly increase blood sugar levels in cases of hypoglycemia. In this situation, the nurse's action is a direct application of the client's prescribed sliding scale for insulin dosage based on their specific blood glucose readings.