My fibrinogen level is currently 143, should I be concerned?

Symptoms? Is there a particular reason why you had your fibrinogen checked? Have you had a bleeding symptoms? Do you have any other "abnormal" labs measuring the coagulation cascade? For most labs, the low normal range for fibrinogen is 150, so you are just below that. Without knowing more about your particular clinical situation, your level of fibrinogen is not worrisome.