Am I Eligible?

Please use the information on this site as a general guide; an evaluation by a medical professional is the only way to determine blood donor eligibility. Before you donate for the first time, we recommend you read our Preparing to Donate page.

Donors must:

  • be at least 18 years of age (16- and 17-year-olds may donate blood with a parent/guardian’s consent). California law requires anyone under the age of 18 to have a parent’s or legal guardian’s permission to donate when their donation will be screened with an investigational (research) test. Donors under the age of 18 should bring the completed consent form (05-FX1) when registering to donate.
  • The consent form can also be obtained:
    • at a Stanford Blood Center donor center
    • at a Stanford Blood Center community blood drive, or
    • from your high school blood drive coordinator
  • weigh at least 110 pounds for donors 19 or older (Donors under 19 — see height/weight requirements)
  • be free of cold and flu symptoms (allergies ok; as are most medications)
  • eat before donating and drink plenty of fluids
  • bring photo ID
  • fill out a Medical History Questionnaire (which will be provided at the time of your donation) and discuss answers confidentially with a Medical Historian
Males 18-Years-Old or Younger
If you are: 4’7” or less 4’8” 4’9” 4’10” 4’11” 5’ or taller
You must weigh at least: 130 lbs. 125 lbs. 123 lbs. 121 lbs. 115 lbs. 110 lbs.


Females 18-Years-Old or Younger
If you are: 5’1” or less 5’2” 5’3” 5’4” 5’5” 5’6” or taller
You must weigh at least: 133 lbs. 129 lbs. 124 lbs. 118 lbs. 115 lbs. 110 lbs.


Males and Females 19-Years-Old or Older
For all heights, you must weigh at least: 110 lbs.

The U.S Food and Drug Administration (FDA), in an attempt to ensure a safe blood supply, has imposed strict controls on who may donate. If you discover that you are not eligible to give blood, you can still save lives by providing blood for research, coordinating a blood drive within your organization, volunteering your time, or contributing financially. However you participate in our programs, you are helping maintain the health of our community. Thank you for your dedication.

After viewing the Medical History Form and the common reasons for deferral below, if you have questions about your eligibility, contact us at (650) 723-7831.

Medical History

You will be asked to complete a Medical History Questionnaire each time you donate blood. Your honesty in answering these questions is a crucial part of the blood donation process.

Once you have completed the form, a Medical Historian will go over your questions and answers with you. He or she may ask for further information, and you will have the opportunity to ask any questions you may have. The Medical Historian will then determine, based on your answers, if you are eligible to donate blood that day. Here are some reasons why a donor may be permanently deferred:

HIV/AIDS You are a person with symptoms or laboratory evidence of HIV virus.
Cancer You have had Leukemia, Lymphoma, multiple myeloma and all other hematologic malignancies.
Heart Disease You’ve ever experienced heart failure or coronary artery disease. Other heart conditions may require your doctor’s permission.
Hepatitis You have a history of the disease.
Organ Failure You have experienced kidney, lung, or liver failure.

Deferral Information

Some people are very disappointed to find that they are not eligible to give blood. There are several reasons for—and even different types of—deferrals. Depending upon the reason, a deferral may be either temporary or permanent. Please read below for more information about some of the common reasons for deferral: