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1. Pt with recurrent gonococcal bacteremia ---> next test in diagnosis
2. Pt worked up for dementia ---> VDRL + ---> next test in diagnosis
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1. complement levels
2. fta abs
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1. Complement levels ... especially late complements C56789 MAC
2. CSF VDRL? TPHA?
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1 ch50 work up
2 fta/tppa test for confirmation
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ANSWER:
1. CH50 is next step ---> if low ---> check terminal complement level (C5, 6, 8)
2. lumbar puncture ---> send CSF fluid for VDRL (neurosyphilis)