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Mp only 馬偕
1. Are manual Polybrene ( MP) only antibodies clinical
significance ? Serological View.
張志昇
馬偕紀念醫院
2014/11/5
2. Outline
Definition of clinical significant antibody & MP only allo-antibody
Background
Literature review
Purpose
Case reports
Laboratory finding
Conclusion
小張的報告 Page 2
3. Definition of clinical significant
An antibody is considered clinically significant if it is capable of inducing either hemolytic disease of the
fetus/newborn (HDFN) or accelerated red cell destruction.
A term used to describe the likelihood a particular blood group antibody that can cause one of two
problems: 1) Hemolytic transfusion reactions (accelerated red blood cell destruction), or 2) Hemolytic
disease of the fetus/newborn (HDFN).
In general, red cell antibodies that react at body temperature (37 C) are more likely to be significant
Most warm antibodies are IgG class rather than IgM.
Antibodies that can cross the placenta and circulate in the fetus are obviously more likely to cause
HDFN, so IgG antibodies are more likely than IgM to be significant from that perspective. However, this
does NOT mean that all IgM antibodies are insignificant.
One of the clues as to whether or not an antibody will be "significant" is whether or not the antibody
reacts at body temperature (37C). The optimal reaction temperature of an antibody is not always
predictive of its clinical significance, but it can definitely guide you in the right direction
小張的報告 Page 3
12. Outline
Definition of clinical significant antibody & MP only allo-antibody
Background
Literature review
Purpose
Case reports
Laboratory finding
Conclusion
小張的報告 Page 12
13. Literature review-1
Manual hexadimethrine bromide (Polybrene) tests (Polybrene in low-ionic medium) were used in
parallel with manual low-ionic-strength solution (LISS) procedures for the routine testing of patient
samples referred to a general hospital blood bank. Of 5646 consecutive sera tested, 5167 (91.5%)
did not react with either technique; 320 sera (5.7%) reacted in both methods. The Polybrene
technique detected 63 antibodies which did not react in the LISS methods. One hundred sera did
not react in the Polybrene test, but did react in the LISS methods. Sera showing discrepant results
between the 2 methods were further tested in a reference laboratory. Polybrene tests appeared to
be better in avoiding reactions due to clinically nonsignificant antibodies. The LISS methods
appeared to be more sensitive in detecting antibodies of potential clinical significance.
Transfusion. 1985 Mar-Apr;25(2):145-8.
小張的報告 Page 13
14. Literature review-2
To explore the comparison of values of microcolunm gel test and polybrene test in irregular
antibody detection.Methods From 2010 to 2011,
6 720 cases with blood transfusion were test by microcolumn gel and polybrene for detecting
irregular antibody,and then positive results were tested about antibody′s specificity by anti-human
globulin test.
28 irregular antibody positive cases were detected by microcolumn gel test and positive rate was
0.42%.Only 26 cases were detected by polybrene test, and positive rate was 0.39%,there was no
statistically significant difference between two methods
《Laboratory Medicine and Clinic》2013-01
小張的報告 Page 14
15. Literature review-3
Anti-Jka, -C, and -E in a single patient, initially demonstrable only by the manual hexadimethrine
bromide (Polybrene) test, with incompatibilities confirmed by 51Cr-labeled red cell studies.
Analysis Antibody Identification Data from Blood Donation and Transfusion Services in Kaohsiung
2007 19:3 J Biomed Lab Sci p99~105(陳嘉文主任)
Comparison Study of the Manual Polybrene, Gel Test, Autovue Innova and Conventional Tube Test
for Antibody Screening. 2006
The comparative analysis and research between microcolumn gel test and polybrene test in
irregular antibody detection. Loboratory medicine 2010, Vol. 25 Issue (03): 179-181
Evaluation of the test using polybrene for the detection of anti-erythrocyte antibodies.
The manual polybrene test: a simple and rapid procedure for detection of red cell antibodies.
Transfusion 20:2 pg 206-11
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16. Evaluation of Ortho BioVue system, the DiaMed Gel system, and Gamma-ReACT
test and their comparison with Manual Polybrene test
12 sample with positive antibody screening results by MP were
collected ans tested again with GEL, CAT, and ReACT antibody
specificities were determined.
MP GEL CAT RACT
Anti-Mia 4 2 3 2
Anti-E 2 1 2 -
Anti-M 2 1 2 -
Anti-C+e 1 1 - 1
Anti-I 3 - 2 -
Nonspecific reaction - 1 3 1
No antibody - 6 - 8
17. Evaluation of Ortho BioVue system, the DiaMed Gel system, and Gamma-
ReACT test and their comparison with Manual Polybrene test (II)
Five hundred and twenty-eight sera which were negative for red cell
antibodies by MP tests were tested with LISS, GEL, CAT,and ReACT.
One hundred and five samples with positive antibody screening results
by MP were collected and again screened with LISS, GEL, CAT, and
ReACT. Antibody was the identified using the corresponding methods.
18. Evaluation of Ortho BioVue system, the DiaMed Gel system, and Gamma-
ReACT test and their comparison with Manual Polybrene test (II) result:
MP LISS GEL CAT ReACT total
Anti-Mia 0 1 1 3 1 3
Anti-Lea 0 0 0 4 0 4
Nonspecific
antibodies
0 0 2 19 0 0
No
antibody
528 527 525 502 527 521
19. Evaluation of Ortho BioVue system, the DiaMed Gel system, and Gamma-
ReACT test and their comparison with Manual Polybrene test (II) Result-2
MP LISS GEL CAT ReACT Total
Anti-Mia 46 28 33 35 25 46
Anti-Mia 11* 2 2 11 2 14
Anti-E 36 14 25 25 18 36
Anti-C 7 1 4 4 2 7
Anti-c 7 0 2 2 0 7
Anti-e 2 0 2 2 2 2
Anti-M 10 0 0 3 0 10
Anti-Lea 7 0 3 3 1 7
Anti-D 2 0 1 1 1 2
Anti-Jka 2 0 1 1 0 2
Anti-P1 2 0 0 0 1 2
Nonspecific
0 6 3 10 3
antibodies
38. Anti-Mia MP only trans-placenta
A case report of a anti-Mia (MP only )
Because of few fetus plasma , MP antibody screening positive, but CAT antibody screening
negative
recheck mother antibody screening : CAT antibody screening negative, MP only anti-Mia antibody
present.
小張的報告 Page 38
47. Outline
Definition of clinical significant antibody & MP only allo-antibody
Background
Literature review
Purpose
Case reports
Laboratory finding
Conclusion
小張的報告 Page 47
48. Conclusion
The MP only allo-antibody show
induced antibodies
due to DAT (polyAHG and mono-IgG) positive( DPC)
eluent specificity same as origin plasma
IgG or IgG+IgM form
same reacted with enzyme treated panel cells
Need DAT IgG1/IgG3 confirm hemolysis potential.
If gel or CAT automation antibody screen was done,
cross-matching with MP method needed
小張的報告 Page 48