Marijuana and Blood Donation: Complete Eligibility Guidelines
Bloodworks Northwest welcomes eligible donors from all walks of life. If you use marijuana (cannabis) and are considering donating blood, you’ll be glad to know that marijuana use alone does not disqualify you from being a blood donor. This comprehensive guide explains everything you need to know about marijuana and blood donation, including waiting periods, eligibility requirements, and the science behind our policies.
Marijuana and Blood Donation: Key Facts
Marijuana use by itself does not prevent you from donating blood. At Bloodworks Northwest, we follow evidence-based guidelines similar to all U.S. blood centers. The primary concern is not whether you use marijuana, but whether you are impaired at the time of donation.
Blood donation takes about an hour, and one donation can save multiple lives in the Pacific Northwest. The actual donation time is only about 10 minutes. Most people in good health are eligible to donate blood every 56 days. Volunteer donors are the only source of blood.
Frequently Asked Questions: Marijuana & Blood Donation
Can you donate blood if you use marijuana?
Yes.
Does donating blood involve a test for marijuana or THC?
No. Bloodworks Northwest does not test donors for THC (the active compound in marijuana) or other cannabinoids. Blood donations are tested for infectious diseases like HIV, hepatitis, and others that could affect recipient safety.
Can I donate blood while under the influence of marijuana?
No. We cannot draw blood from you if you are under the influence of any substance
like alcohol or marijuana . If you appear visibly under the influence, you will be asked
to come back another time.
How long does marijuana stay in your bloodstream?
When smoked: Cannabis is rapidly absorbed and its effects are rapidly felt, peaking about 10 to 15 minutes after use. The active compound (THC, or Tetrahydrocannabinol) clears from the bloodstream after two or three hours. Metabolites stay in body tissues and are measurable for some time.
When consumed as edibles: Edibles take longer to absorb and appear in the bloodstream about 40 minutes after use. Its effects more slowly, and the active compound takes approximately four hours to be cleared from the bloodstream. Metabolites stay in body tissues and are measurable for some time
For regular users: If you use marijuana regularly, THC and its metabolites may be stored in fat cells and released gradually over time. However, this does not affect your eligibility to donate blood as long as you are not under the influence during donation.
How long after using marijuana can I donate blood?
We recommend that you wait 24 hours between using cannabis and donating blood.
Does donated blood from a marijuana user pose any threat to recipients?
No. There is no evidence that blood from donors who use marijuana (but are not under the influence at the time of donation) poses any risk to recipients. The trace amounts of THC that might remain in the bloodstream are not considered clinically significant for blood transfusion purposes.
What can disqualify you from donating blood or plasma related to marijuana?
The only marijuana-related disqualification is being under the influence at the time of donation. Unlike some other substances, past marijuana use does not affect your eligibility. However, if you use synthetic marijuana products (K2, Spice), different rules may apply due to potential contamination with harmful substance
Physiological Effects and Blood Donation Considerations
Marijuana can temporarily affect your cardiovascular system by:
- Dilating blood vessels
- Increasing heart rate
- Potentially altering blood pressure
These effects are why we recommend waiting 24 hours after use before or after donating. During blood donation, your body needs to maintain stable blood pressure and heart rate. Being fully recovered from marijuana’s effects ensures a safer, more comfortable donation experience, however our primary concern for not using marijuana before blood donation is to ensure you are sober and capable of answering the health history questionnaire and consenting at the time of donation.
Special Considerations for Medical Marijuana Users
If you use marijuana or products containing CBD for medical purposes, you can still donate blood. Here are some important points to consider:
- The medical condition for which you use marijuana may affect your eligibility more than the marijuana itself
- Inform the screening staff about your medical conditions and all medications/treatments you receive
- Plan your donation for a time when you can comfortably go without medication for the recommended waiting period
- If you have questions about your specific medical situation, please contact our Clinical Specialists at (425) 656-3077 (option 1)
Donation Process for Marijuana Users
The donation process for marijuana users is identical to that for non-users:
- Register and complete a confidential health questionnaire
- Undergo a mini-physical examination (temperature, blood pressure, pulse, hemoglobin level)
- Donate blood (approximately 10 minutes)
- Enjoy refreshments in our recovery area
You must not be under influence at time of donation. Save marijuana use for after donating. Remember to hydrate well before and after donation, eat a healthy meal beforehand, and avoid strenuous activity for several hours afterward.
Donors can find locations of donor centers and drives or make appointments online.
Have More Questions About Blood Donation?
Our team is here to help. Please call a Clinical Specialist at (425) 656-3077 (option 1) or email [email protected] with any questions about marijuana use and blood donation eligibility.
