Do not request a Duplex scan as a first level test for lower limb arterial disease, in patients that are asymptomatic or with mild claudication.  Measure instead the Ankle Brachial Index (ABI).

Do not perform Duplex scan or Chest CT scan as first level tests for patients that, according to Wells or Geneva score, have a low probability of Deep Venous Thrombosis (DVT). D-dimer determination has a high sensitivity as a first level test.

DVT and Pulmonary Embolism (PE) are very rare in the absence of elevated D dimer levels or specific risk factors. DVT of the lower limbs is a common disease and it is usually suspected in the presence of swelling. Swelling may be due to orthopedic, cardiac or...
Do not perform computed tomography (CT) or nuclear magnetic resonance imaging (MRI) of the brain to patients who have experienced transient loss of consciousness in the absence of other neurological symptoms and have normal neurological examination. Adapted from the American College of Physicians

Do not perform computed tomography (CT) or nuclear magnetic resonance imaging (MRI) of the brain to patients who have experienced transient loss of consciousness in the absence of other neurological symptoms and have normal neurological examination. Adapted from the American College of Physicians

In patients who have experienced a witnessed loss of consciousness, without the suspicion of seizure and in the absence of other neurological signs or symptoms, the probability that central nervous system damage is the cause is very low and imaging of the brain does...
Do not perform computed tomography (CT) or nuclear magnetic resonance imaging (MRI) of the brain to patients who have experienced transient loss of consciousness in the absence of other neurological symptoms and have normal neurological examination. Adapted from the American College of Physicians

Do not perform supra-aortic trunks ultrasound to patients who have experienced transient loss of consciousness in the absence of other neurological symptoms and with normal neurological examination. Adapted from the American Academy of Neurology.

A vertebrobasilar TIA (transient ischemic attack) can cause loss of consciousness, but it is always accompanied by neurological signs such as motor or sensory loss in the face and / or limbs, coordination impairment, homonymous lateral hemianopia, balance and gait...