Abstract
Background
We carried out a questionnaire survey for laboratories performing human leukocyte antigen-crossmatch (HLA-XM) to provide a basis for laboratory standardization of HLA-XM tests in Korea.
Methods
The questionnaires were distributed to 51 HLA laboratories participating in the HLA-XM part of the HLA proficiency survey program organized by the Korean Society for Laboratory Medicine and replies from 50 laboratories were analyzed. The questionnaires included following items: 1) HLA-XM methods performed and annual number of tests, 2) types of the specimen and lymphocyte separation methods, 3) test procedures and reagents for complement-dependent cytotoxicity crossmatch (CDC-XM) and flow cytometry crossmatch (FCXM).
Results
The number of laboratories performing anti-human globulin (AHG) CDC-XM (47/49, 96%) and FCXM (30/50, 60%) was considerably increased compared to the 2005 survey (AHG CDC-XM, 35/43, 81%; FCXM, 7/44, 16%). As for the annual number of XM tests, more than 50% of the laboratories were low volume laboratories performing ≤50 tests, and only 10% of the laboratories were performing >500 tests. For cell isolation methods, negative selection was used by 43% (21/49) of laboratories performing CDC-XM. Number of cells reacted per 1 μL of serum varied among different laboratories in both CDC-XM (1,000–8,000) and FCXM tests (1,300-20,000). For the interpretation of FCXM, log fluorescence ratio (26/30, 87%) was more commonly used than channel shift values (5/30, 17%).
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Table 1.
HLA crossmatch methods used by the participant laboratories (N=50)
T-CDC∗ | B-CDC∗ | T-FC† | B-FC† | No. (%) |
---|---|---|---|---|
+ | – | – | – | 8 (16) |
+ | + | – | – | 12 (24) |
+ | + | + | – | 6 (12) |
+ | + | + | + | 17 (34) |
+ | – | + | – | 1 (2) |
+ | – | + | + | 5 (10) |
– | – | + | + | 1 (2) |
Table 2.
Phases of CDC crossmatches used by the participant laboratories (N=50)
Crossmatch | NIH | Amos wash | Long incubation | AHG | No. (%) |
---|---|---|---|---|---|
T-CDC∗ | + | – | – | + | 39 (68) |
+ | – | + | + | 4 (8) | |
+ | – | + | – | 2 (4) | |
– | – | + | + | 2 (4) | |
– | + | + | + | 1 (2) | |
– | – | – | + | 1 (2) | |
– | – | – | – | 1 (2) | |
B-CDC† | + | – | – | – | 32 (64) |
+ | + | – | – | 1 (2) | |
+ | – | – | + | 2 (4) | |
– | – | – | – | 15 (30) |
Table 3.
Annual number of HLA crossmatch tests performed by the participant laboratories in 2013 and 2014
Table 4.
Types of the cells and cell separation methods used for HLA crossmatch by the participant laboratories (N=50)
Crossmatch methods (N) | Types of the cells (N, %) | Nylon wool No. (%) | Negative selection No. (%) | Positive selection No. (%) | Nylon wool or negative selection No. (%) |
---|---|---|---|---|---|
T-CDC (49) | MNC∗ (8, 16) | ||||
T cell (34, 69) | 15 (31) | 11 (22) | 5 (10) | 3 (6) | |
Total lymphocyte (7, 14) | 0 (0) | 7 (14) | 0 (0) | 0 (0) | |
B-CDC (35) | MNC∗ (1, 3) | ||||
B cell (34, 97) | 14 (49) | 12 (34) | 5 (14) | 3 (9) | |
T-FC (30) | MNC∗ (20, 67) | ||||
T cell (3, 10) | 0 (0) | 2 (7) | 0 (0) | 1 (3) | |
Total lymphocyte (7, 23) | 0 (0) | 7 (23) | 0 (0) | 0 (0) | |
B-FC (23) | MNC∗ (15, 65) | ||||
B cell (2, 9) | 0 (0) | 1 (4) | 0 (0) | 1 (4) | |
Total lymphocyte (6, 26) | 0 (0) | 6 (26) | 0 (0) | 0 (0) |
Table 5.
Number of cells and volume of sera used for CDC crossmatc by the participant laboratories (N=49)
No. of cells per well | Volume of sera per well (uL) | No. (%) |
---|---|---|
2,000-3,000 | 1 | 35 (71) |
2,000-3,000 | 1.4 | 1 (2) |
2,000-3,000 | 2 | 3 (6) |
2,000-3,000 | 1 or 2∗ | 1 (2) |
2,000-5,000 | 1 | 1 (2) |
2,000-5,000 | 2 | 1 (2) |
3,000-4,000 | 1 | 2 (4) |
3,000-5,000 | 1 | 2 (4) |
5,000 | 2 | 1 (2) |
7,000 | 2 | 1 (2) |
8,000 | 1 | 1 (2) |
Table 6.
Type of media and percentage of FCS used for serum dilution of CDC crossmatch by the participant laboratories (N=49)
Media | Percentage of FCS used, No.(%) | Total No. (%) | ||||||
---|---|---|---|---|---|---|---|---|
0% | 2% | 3% | 5% | 10% | 15% | 20% | ||
RPMI 1640 | 6 (12) | 3 (6) | 1 (2) | 16 (33) | 8 (16) | 2 (4) | 1 (2) | 37 (76) |
IMDM | 3 (6) | 6 (12) | 9 (18) | |||||
McCoy | 2 (4) | 2 (4) | ||||||
PBS | 1 (2) | 1 (2) |
Table 7.
Incubation conditions of CDC crossmatch used by the participant laboratories (N=49)
Table 8.
Number of cells and volume of sera used for flow cytometry crossmatch by the participant laboratories (N=30)
Table 9.
Incubation conditions of flow cytometry crossmatch used b the participant laboratories (N=30)
Cell and serum incubation | Conjugate incubation | No. (%) | ||
---|---|---|---|---|
Temperature | Time, minutes | Temperature | Time, minutes | |
RT | 15 | RT | 20 | 1 (3) |
RT | 20 | RT | 20 | 4 (13) |
RT | 20 | 4°C | 30 | 2 (7) |
RT | 30 | RT | 15 | 1 (3) |
RT | 30 | RT | 20 | 5 (17) |
RT | 30 | RT | 30 | 3 (10) |
RT | 30 | 4°C | 20 | 2 (7) |
RT | 30 | 4°C | 30 | 5 (17) |
RT | 60 | RT | 45 | 1 (3) |
RT | 30∗/60† | RT | 30∗/60† | 1 (3) |
37°C | 20 | RT | 20 | 2 (7) |
37°C | 20 | RT | 30 | 1 (3) |
37°C | 30 | 4°C | 30 | 2 (7) |
Table 10.
Analysis of flow cytometry crossmatch results by the participant laboratories (N=30)
Table 11.
Cut-off values of log MFI ratio for positive flow cytometry crossmatch by the participant laboratories (N=26)