We found that male gender (p value < 0.01), tachycardia (p value < 0.01), higher intensity of pain (>3 in numerical pain scale of 0-10) (p value < 0.01), hypoalbuminemia (serum albumin < 3.5 gr/dL) (p value = 0.03), hyponatremia (p value < 0.01), and anemia (as identified as hemoglobin < 13.5 for males, and 12.0 for females) were associated with ED re-visit in 30 days (Table 3). Here, ALB is linked to anemia (phenotype).