Blood Donor Program

Providing Blood Donation Services with Care & Compassion

Mercy is the only hospital in Missouri that is mobile for its own blood supply. When you give blood or platelets, you give the precious gift of life to someone. Everyday, people of all ages and from all walks of life will unexpectedly need blood. They could be accident victims, cancer patients, someone undergoing surgery, or the tiny babies in the neonatal intensive care unit. They could be someone you know. Your caring spirit and the time given to donate blood can help save someone's life. We value your time and your contribution.

Mercy offers the following blood donor services:

  • Whole Blood Donor Collection
  • Autologous and Directed Blood Collection
  • Apheresis Platelet Collection
  • Therapeutic Phlebotomy

Blood Donor Services

Patient Stories

Donate Blood Now

Why Donate?

Your blood donation directly helps the people who need it most. It costs you nothing to give and your donation makes a positive difference in the life of another person.

Can I Give?

To donate blood you have to be over the age of 16*, weigh at least 115 pounds, and be in good health.

*16-year-old donors are required to bring a parental consent form, completed in ink, in order to donate.

Who Will I Help?

Your donation will help trauma patients, cancer patients, new moms or other patients fighting any number of illnesses. Donors may also request their blood donation be directed to a specific patient. Read our Directed Donations Fact Sheet for more information. The donor will also need to complete the Directed Donation Request Form.

Host a Blood Drive

Mercy makes it easy to schedule a blood drive for your school, business, church or group. We'll help with the tools to get organized and bring our mobile technicians to you. Saving lives has never been more convenient. To learn more, call us at: 314-251-4483

Learn More About Blood Donation

How Much Blood Does One Patient Need?

Heart patients: 2-8 units of packed red cells
Car accident trauma patient: 4-12 units of packed red cells
Cancer patient on chemotherapy: 6-12 units
Neonatal Intensive Care Unit (NICU) baby: 5-10 transfusions of packed red cells

Monthly usage for Mercy St. Louis and Mercy Washington alone is more than 1,100 units.

Donation Facts

  • It takes about 10 minutes for your actual blood donation. The start to finish time, signing in, screening, donation and snack, takes about an hour.
  • You cannot get AIDS or any other infectious disease by donating blood.

Blood Facts

  • One out of three people need donated blood in their life.
  • One out of 10 hospital patients needs a blood transfusion.
  • Blood is always needed for treatment of accident victims, cancer patients, hemophiliacs and surgery patients.
  • There is no substitute for human blood.

Blood Donor Programs

NICU Program: O Negative Individuals

In this program, O negative donors commit to giving blood 2 to 4 times a year. Their blood is dedicated for transfusions to our babies in the Neonatal Intensive Care Unit (NICU). These baby-saving heroes are distinguished by the “Baby Foot” keychain that were given to them when they commit to the making the difference to the lives of our NICU babies’ lives.

Platelet Donor Program: Dedicated Donors Who Also Give Their Time

In this program, donors of various blood types commit to giving a few hours of their time to donate the gift of platelets more than once a year. All donors get to select a gift card to a popular food/beverage establishment after each donation.

Donors who commit to donating six times a year receive a special gift as a token of our appreciation for their generosity.

Type O Donor Program: O Positive and O Negative Individuals

Donors in this program commit to giving blood 2 to 4 times a year. The donated blood is used for transfusions to our type O patients.

Rare Donor Program: Individuals with Rare Antigens

These donors are people with very special blood that is hard to find. Their blood is compatible with a small group of patients whose body will tolerate only blood from specific donors. Donors in this program commit to come in and donate blood whenever we contact them because of a specific patient need.


Mercy Hospital St. Louis

615 S. New Ballas Road
Saint Louis, MO 63141
(314) 251-4483

Your time is valuable. To minimize waiting time, please call and make an appointment. Recent travel to certain locals may be a cause for deferral, so please call ahead and discuss your travel history.    

If you come without an appointment, please:

  • Know that we will do our best to serve you as quickly as we can
  • Be at our collection site at least:
    • 1 hour prior to closing time for blood donation
    • 2 hours prior to closing time for platelet donation.