Two hematological biomarkers, albumin (SMD = −0.58, 95% CI (−0.75, −0.42), K = 37, N = 18,178, I2 =94.2%) (Figure 5a) and hemoglobin (SMD = −0.59, 95% CI (−0.85, −0.33), K = 23, N = 6908, I2 =94.4%) (Figure 5b), were significantly negatively correlated with sarcopenia across all four classifications (Figure S28 and Figure S29). Here, ALB is linked to sarcopenia.