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In the context of assessing a commercial driver's health, a referral to a primary care provider is typically warranted when there are indications of potential health issues that may affect the individual's ability to safely operate a vehicle. A normal laboratory result signifies that there are no abnormalities detected that require further medical investigation. Thus, it does not indicate any pressing health concerns that would necessitate a referral.

Conversely, the other options represent conditions or symptoms that often require further evaluation and management by a primary care provider. For example, a palpable mass in the abdomen could suggest a serious underlying condition that needs to be further investigated. Hypertension readings indicate that blood pressure levels may be higher than normal, which can lead to serious health complications if left unaddressed, warranting professional medical follow-up. Signs of liver disease, such as jaundice, elevated liver enzymes, or other symptomatic presentations, also typically require referral for appropriate examination and management.

In summary, normal laboratory results do not present any red flags that necessitate further medical attention, making it the option that would not indicate the need for referral to a primary care provider.