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Apheresis to Obtain Plasma or White Blood Cells for Laboratory Studies

This study is currently recruiting participants. (see Contacts and Locations)
Verified February 10, 2017 by National Institutes of Health Clinical Center (CC) ( National Institute of Allergy and Infectious Diseases (NIAID) )
Information provided by (Responsible Party):
National Institutes of Health Clinical Center (CC) ( National Institute of Allergy and Infectious Diseases (NIAID) ) Identifier:
First received: November 3, 1999
Last updated: April 20, 2017
Last verified: February 10, 2017

This study will collect blood plasma and white blood cells for laboratory research using a procedure called apheresis. Apheresis is a method of collecting larger quantities of certain blood components than can safely be collected through a simple blood draw.

Patients 7 years of age and older with a parasitic infection or condition associated with a parasitic infection (i.e., elevated levels of IgE antibodies or of a type of white cell called eosinophils) who are currently enrolled in a NIH clinical research protocol may be eligible for this study. Relatives of patients and normal healthy volunteers will also be enrolled. Candidates will have a medical history, physical examination and blood tests. Individuals weighing less than 25 kilograms (55 pounds) may not participate.

Participants will undergo one of the following two apheresis procedures:

  • Automated pheresis Whole blood is drawn through a needle placed in an arm vein and circulated through a cell separator machine. The plasma (liquid part of the blood) and white cells are extracted, and the red cells are re-infused into the donor through a needle in the other arm. The procedure takes 1 to 2 hours.
  • Manual pheresis Whole blood is drawn through a needle placed in an arm vein and circulated through the cell separator machine. The red blood cells are separated from the rest of the blood and returned to the donor through the same needle. Usually only one needle stick is required and the procedure takes from 30 to 45 minutes. This method is used only in individuals who weigh less than 35 kg (77 pounds).


Study Type: Observational
Official Title: Apheresis Procedures to Obtain Plasma or Leukocytes for In Vitro Studies

Further study details as provided by National Institutes of Health Clinical Center (CC) ( National Institute of Allergy and Infectious Diseases (NIAID) ):

Estimated Enrollment: 300
Study Start Date: December 15, 1992
Detailed Description:
In order to carry out in vitro research procedures on the plasma or leukocyte components of blood, it is often necessary to obtain larger quantities of plasma, leukocytes, or platelets than can be safely obtained by simple phlebotomy. These components can be easily and safely obtained using apheresis procedures in the Clinical Center Apheresis Unit. This protocol is specifically designed to conform to the requirements of the Apheresis Unit for donors to have apheresis procedures (greater than 7 years of age and greater than or equal to 25 kg) but the protocol in itself is not a research protocol. Donors must first be admitted to another approved clinical research protocol of the NIAID before they may have the apheresis procedures described in this protocol.

Ages Eligible for Study:   7 Years and older   (Child, Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
  • Enrolled on another LPD protocol.
  • Weight greater than or equal to 25 kg
  • Willingness to participate


  • Age less than 7 years
  • Weight less than 25 kg
  • Cardiovascular instability
  • Hct less than 30
  • Inadequate venous access
  • PTT or PT greater than 1.5 normal
  • Pregnancy
  • Other condition which the attending physician or Apheresis Unit staff considers a contraindication to the procedure
  • For Hetastarch procedure
  • Hypertension
  • Evidence of fluid retention
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00001349

Contact: Thomas B Nutman, M.D. (301) 496-5399

United States, Maryland
National Institutes of Health Clinical Center, 9000 Rockville Pike Recruiting
Bethesda, Maryland, United States, 20892
Contact: For more information at the NIH Clinical Center contact Patient Recruitment and Public Liaison Office (PRPL)    800-411-1222 ext TTY8664111010   
Sponsors and Collaborators
National Institute of Allergy and Infectious Diseases (NIAID)
Principal Investigator: Thomas B Nutman, M.D. National Institute of Allergy and Infectious Diseases (NIAID)