Since Adderall is a stimulant medication used for ADHD it probably has a vasoconstrictive action (similar to caffeine). Vasoconstriction means that the smaller blood vessels get slightly smaller in order for a larger volume of your blood to be directed to your larger organs. Because of this action, the blood vessels and capillaries that supply blood to you arms, fingers, legs, and toes become smaller which means slightly less circulation which can cause them to become cooler than usual. Cold hands, fingers, feet, and toes doesn't always mean that your blood is "thinner" and there is no literature on Adderall that states that Adderall "thins your blood".
Medication for ADHD: What you need to know
Medication can help reduce symptoms of hyperactivity, inattentiveness, and impulsivity in children and adults with attention deficit hyperactivity disorder (ADHD), formerly known as ADD. However, medications come with side effects and risks—and they’re not the only treatment option. Whether you’re the parent or the patient, it’s important to learn the facts about ADHD medication so you can make an informed decision about what’s best for you or your child.
I can't find any evidence that adderall thins the blood, but from personal experience, when I take adderall my extremities get very cold, like my hands and feet get very cold even if it is a warm day outside. so I am not sure if it thins your blood or not but it definitely seems to make your extremities cold and that kinda seems like maybe it is thinning you blood.
A CBC is a complete blood count test. Adderall will show on this test, but it is not what the doctors are looking into.
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Do not take Adderall if you have heart disease, hardening of your arteries, high blood pressure.
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When blood is pumped into the thin-walled blood vessels of the lungs, carbon dioxide is replaced with oxygen.
http://wiki.answers.com/Q/Will_adderall_affect_hsv_blood_tests"