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Related Experiment Videos

Red cell antigen stability in K3EDTA.

C M Westhoff1, B D Sipherd, L D Toalson

  • 1Blood Bank Consultation Services, Clinical Laboratories of Lincoln/A Nichols Institute Laboratory, and the University of Nebraska, 338 Manter Hall, Lincoln, NE 68588-0118, USA.

Immunohematology
|December 1, 1993
PubMed
Summary
This summary is machine-generated.

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Red blood cells collected in EDTA can be reliably tested for blood group antigens for at least 14 days, even up to 60 days for many antigens. This stability supports extended use of EDTA samples for antigen typing.

Area of Science:

  • Transfusion Medicine
  • Immunology
  • Hematology

Background:

  • Commercial blood grouping reagents lack approval for ethylenediaminetetraacetic acid (EDTA) anticoagulated blood specimens older than 48 hours.
  • Limited data exists on the stability of blood group antigens in EDTA compared to other anticoagulants.

Purpose of the Study:

  • To evaluate the stability and reactivity of red blood cell antigens in EDTA anticoagulated blood using commercially available blood grouping reagents.
  • To determine acceptable storage durations for EDTA samples for reliable antigen typing.

Main Methods:

  • Red blood cells were collected and stored in EDTA.
  • Antigen reactivity was assessed using standard blood grouping reagents at defined intervals.
  • Acceptable reaction strength was defined as 2+ (score 8).

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Main Results:

  • A, B, and D antigen reactions remained stable for up to 60 days.
  • Most antigens (except Lea) showed acceptable reactivity (≥2+) at 14 days.
  • By day 21, only Lea, Fyb, and e antigens showed reactivity below 2+.
  • Twelve of twenty-one tested antigens maintained ≥2+ reactivity at day 60.
  • Antigen reactivity in EDTA was comparable or superior to clotted specimens.

Conclusions:

  • Red blood cells collected and stored in EDTA demonstrate reliable antigen reactivity for at least 14 days, and often longer for most antigens.
  • EDTA-stored red cells can be used for dependable antigen typing beyond the currently approved 48-hour window.
  • Findings support the extended use of EDTA samples in blood banking and transfusion services.