Final answer:
The client with a fasting plasma glucose level of 99 mg/dL is within the normal range and does not have diabetes. Levels above 100 mg/dL could indicate prediabetes, and levels higher than 125 mg/dL usually suggest diabetes.
Step-by-step explanation:
A client with a fasting plasma glucose level of 99 mg/dL does not have diabetes; this level is considered to be within the normal range. A fasting blood glucose level below 100 mg/dL is normal and does not indicate any form of diabetes. Levels between 100 and 125 mg/dL suggest prediabetes, and a level higher than 125 mg/dL could indicate diabetes. Since the client's level is below the prediabetes threshold, they would not be diagnosed with Type 1 diabetes, Type 2 diabetes, or Gestational diabetes mellitus. Additionally, proper management of Type 2 diabetes involves lifestyle changes that may increase insulin sensitivity, which can help maintain normal blood glucose levels.