Lumbar puncture (LP) carries a relatively small risk of hemorrhagic complications, including traumatic tap (a lab finding) and spinal hematoma (an imaging finding).  

In a cohort study of 83,000 LPs, the risk of spinal hematoma was not significantly increased in patients with documented coagulopathy (0.23% versus 0.20%), with coagulopathy defined by Plt < 150,000, INR > 1.4, aPTT > 39s. 

Data on platelet transfusion and anticoagulant reversal prior to LP are limited to small retrospective cohort studies and case series. However, the limited data on this subject show no significant difference in major bleeding complications in patients who did or did not receive reversal prior to LP. 

Although the risk of iatrogenic spinal hematoma may be low, current guidelines generally support the following practices:

1. Plt < 50,000: Platelet transfusion is recommended prior to LP. Some studies suggest 40,000 is also a safe threshold.  
2. INR > 1.4: Consider correction with Vit K or PCC prior to LP 
3. aPTT > 40s: Consider correction based on cause (factor deficiency or heparin effect) prior to LP.
4. Aspirin: Not considered a contraindication, no reversal needed
5. DAPT: No clear guidelines. One small study demonstrated no increased risk of spinal hematoma.
6. DOACs: Consider reversal if last dose < 24 hours and LP is emergently indicated.
7. Resumption of AC: Generally considered safe after 12-24 hours if no evidence of bleeding or neurological complications.

References

1. Bodilsen J, Mariager T, Vestergaard HH, Christiansen MH, Kunwald M, Lüttichau HR, Kristensen BT, Bjarkam CR, Nielsen H. Association of Lumbar Puncture With Spinal Hematoma in Patients With and Without Coagulopathy. JAMA. 2020 Oct 13;324(14):1419-1428. doi: 10.1001/jama.2020.14895. PMID: 33048155; PMCID: PMC8094417.
2. Dodd KC, Emsley HCA, Desborough MJR, et al. Pract Neurol Epub ahead of print. doi:10.1136/ practneurol-2017-001820
3. Ran Q, He J, Zheng X, Chen H. Safety of lumbar puncture in patients on antiplatelet therapy: A real-world study assessing red blood cell counts in cerebrospinal fluid. J Int Med Res. 2025 Oct 14;53(10):03000605251386563. doi: 10.1177/03000605251386563. PMCID: PMC12536123.