“…From the expanded electronic database search, we identified 26 articles for analysis. Four articles (Bassett & Smyer, 2003; MacDonald, Sarna, Uman, Grant, & Weitzel, 2006; Oliffe, 2007; Setter, Corbett, Campbell, Cook, & Gates, 2003) used the biological marker conceptually and explored its use from an educational or practice perspective (e.g., the meaning of hemoglobin A1c to patients or providers), rather than its specific use as a variable of interest in the research analysis, thus they were excluded from this review. This left 22 articles for full review and analysis.…”