This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Anesthesia, Subject name: Anaesthesia
All true except 
Select and explain. 
A. Patient on warfarin is contraindicated to LP, B. LMWH should be stopped 24 hours prior to LP, C. IV Heparin should be stopped 6 hours before LP, D. Aspirin is not a contraindication to lumbar puncture
C: IV Heparin should be stopped 6 hours before LP
Answer: C: IV Heparin should be stopped 6 hours before LP 
Explanation: Ans. C. IV Heparin should be stopped 6 hours before LPExplanationLow dose aspirin <150 mg per day aspirin is not a contraindication to LP.DrugTime to stop before LPTime after LP to start anticoagulationHeparin2-4 hours2 hoursLMWH24 hours (Therapeutic)4 hoursFondaparinux72 hours12 hoursRivaroxaban72 hours fllHI6 hoursDabigatran120 hours6 hoursApixaban72 hours6 hoursPrasugrel7-10 days6 hoursTicagrelor5-7 days6 hoursClopidogrel7 days2 hours