A 19-year-old, African-American male reports to the emergency room at midnight. He states that 3 days prior to presentation he was punched in the eye and has had decreased vision in the eye and pain ever since. He has no prior eye diseases or trauma.
On examination, he now has hand motion (HM) vision in the affected eye and an IOP of 70 mmHg (the IOP in the other eye is 14mmHg). It is now 3 AM and you are about to give the patient IV Diamox to lower the IOP. You remember that you should check a “blood test” before giving Diamox in such patients.