Effects of hemoglobin C and S traits on the results of 14 commercial glycated hemoglobin assays.
Glycated hemoglobin is widely used in the management of diabetes mellitus. At least 300,000 Americans with diabetes mellitus have the hemoglobin (Hb) C or S trait. The accuracy of HbA1c methods can be adversely affected by the presence of these traits. We evaluated the effects of HbC and HbS traits on the results of 14 commercial HbA1c methods that use boronate affinity, enzymatic, immunoassay, and ion exchange methods. Whole blood samples from people homozygous for HbA or heterozygous for HbC or HbS were analyzed for HbA1c. Results for each sample type were compared with those from the CLC 330 comparative method (Primus Diagnostics, Kansas City, MO). After correcting for calibration bias by comparing results from the homozygous HbA group, method bias attributable to the presence of HbC or HbS trait was evaluated with a clinically significant difference being more than 10% (ie, 0.6% at 6% HbA1c). One immunoassay method exhibited clinically significant differences owing to the presence of HbC and HbS traits.
Mongia
Shella K
SK
Department of Pathology, University of Utah, Salt Lake City, UT, USA.
Little
Randie R
RR
Rohlfing
Curt L
CL
Hanson
Steve
S
Roberts
Richard F
RF
Owen
William E
WE
D'Costa
Mario A
MA
Reyes
Christine A
CA
Luzzi
Veronica I
VI
Roberts
William L
WL
D000755:Anemia, Sickle Cell / Q000097:blood*; D002852:Chromatography, Ion Exchange / Q000379:methods; D003951:Diagnostic Errors; D006442:Glycated Hemoglobin / Q000032:analysis*; D006445:Hemoglobin C Disease / Q000097:blood*; D006452:Hemoglobinometry / Q000379:methods*; D006801:Humans; D007118:Immunoassay / Q000379:methods
D006442:Glycated Hemoglobin; C517652:hemoglobin A1c protein, human