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Hello from JustAnswer.
It will help if you could first provide some further information.
Was the remainder of the blood count normal?
Do you have any chronic medical problems?
Do you smoke?
Thank you for the additional information.
First, it is not necessary to bring a RBC of 4.83 down. Although the normal range can vary between labs, this value is within the normal range for many labs. For it to trigger this question, it must have been labeled as being high for the lab that did your blood work, but even a mild elevation in RBC is typically not a concern when the haemoglobin is 142 and the indices are normal (the indices are the mean corpuscular haemoglobin, mean corpuscular volume, and mean corpuscular haemoglobin concentration).
Since you do not have any other medical problems, that also would indicate that a mild elevation in RBC is not a sign of worsening disease. The most common reason that we see an increase in RBC and haemoblobin levels is in response to a chronic medical condition that affects oxygen levels, such as chronic lung disease (from smoking) or congestive heart failure.
Since the remainder of the blood count is unremarkable and you have no chronic medical conditions and do not smoke, then the only action that you need to do are generally healthy interventions, such as eating a healthy diet and getting regular aerobic exercise to maintain cardiovascular conditioning.
You are very welcome.