TY - JOUR
T1 - Variability of IgE protein measurement in cell-culture supernatants
T2 - Results from a multicenter collaborative study
AU - Helm, Ricki M.
AU - Buckley, Rebecca H.
AU - Adkinson, N. Franklin
AU - Squillace, Diane L.
AU - Gleich, Gerald J.
AU - Yunginger, John W.
N1 - Funding Information:
From the *Departments of Immunology, Pediatrics, and Internal Medicine (Allergy), Mayo Medical School and the Allergic Dis-eases Research Laboratory, Mayo Clinic ,md Foundation, Roch-ester, Minx; **Division of Pediatric Allergy and Immunology, Duke University Medical Center. Durham, N. C.; and the ***Good Samaritan Hospital, Johns Hopkins University, Balti-more, Md. Supported in part by a United States Public Health Service Contract AI-12675 and by the Mayo Foundation. Received for publication Sept. 9, 1985. Accepted for publication Jan. 9, 1986. Reprint requests: J. W. Yunginger, M.D., Allergic Diseases Re-search Laboratory, 406 Guggenheim Bldg., Mayo Clinic, Roch-ester, MN 55905.
PY - 1986/6
Y1 - 1986/6
N2 - The sensitivity, specificity, and precision of immunoassays for quantitation of IgE in cell-culture supernatants were tested in a multicenter trial involving 22 laboratories. Fourteen coded test samples included cell-culture medium alone, culture medium with varying concentrations of polyclonal or myeloma IgE, and medium from unstimulated or pokeweed mitogen (PWM)-stimulated peripheral blood mononuclear cell (PBMC)-culture supernatants. Two laboratories reported measurable IgE in non-IgE-containing control samples. Although the IgE content of a single 0.50 ng%ml polyclonal IgE sample should have been measured easily by the claims of all laboratories, only 13 laboratories measured IgE in this sample in 22 of the 48 assays. Most laboratories could measure both polyclonal and myeloma IgE at 5.0 nglml; however, the IgE determinations for the myeloma proteins were nearer the predicted value. Although 15 laboratories found measurable IgE in the PWM-stimulated PBMC-culture supernatants from a single nonatopic donor, the levels did not differ significantly from that measured in unstimulated PBMC-culture supernatants. Three laboratories reported considerably higher IgE levels in the PWM-stimulated PBMC-culture supernatants than in other PBMC-culture supernatants. Only 13 laboratories could quantitate IgE in each of coded duplicate samples containing 0.50 nglml polyclonal IgE. These findings indicate a wide variability in the sensitivity, specificity, and precision of assays used to quantitate low levels of IgE protein. Investigators should be encouraged to make greater use of existing national and international reference materials in the standardization and performance of their IgE immunoassays.
AB - The sensitivity, specificity, and precision of immunoassays for quantitation of IgE in cell-culture supernatants were tested in a multicenter trial involving 22 laboratories. Fourteen coded test samples included cell-culture medium alone, culture medium with varying concentrations of polyclonal or myeloma IgE, and medium from unstimulated or pokeweed mitogen (PWM)-stimulated peripheral blood mononuclear cell (PBMC)-culture supernatants. Two laboratories reported measurable IgE in non-IgE-containing control samples. Although the IgE content of a single 0.50 ng%ml polyclonal IgE sample should have been measured easily by the claims of all laboratories, only 13 laboratories measured IgE in this sample in 22 of the 48 assays. Most laboratories could measure both polyclonal and myeloma IgE at 5.0 nglml; however, the IgE determinations for the myeloma proteins were nearer the predicted value. Although 15 laboratories found measurable IgE in the PWM-stimulated PBMC-culture supernatants from a single nonatopic donor, the levels did not differ significantly from that measured in unstimulated PBMC-culture supernatants. Three laboratories reported considerably higher IgE levels in the PWM-stimulated PBMC-culture supernatants than in other PBMC-culture supernatants. Only 13 laboratories could quantitate IgE in each of coded duplicate samples containing 0.50 nglml polyclonal IgE. These findings indicate a wide variability in the sensitivity, specificity, and precision of assays used to quantitate low levels of IgE protein. Investigators should be encouraged to make greater use of existing national and international reference materials in the standardization and performance of their IgE immunoassays.
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U2 - 10.1016/0091-6749(86)90387-8
DO - 10.1016/0091-6749(86)90387-8
M3 - Article
C2 - 3711555
AN - SCOPUS:0022549532
SN - 0091-6749
VL - 77
SP - 880
EP - 890
JO - The Journal of allergy and clinical immunology
JF - The Journal of allergy and clinical immunology
IS - 6
ER -