Several blood parameters showed significant associations with malnutrition severity: Na (OR = 2.155, 95% CI: 1.127–4.121) and K (OR = 257.752, 95% CI: 2.428–2.74 × 104) levels demonstrated maintained directional agreement with malnutrition severity grading, as did CRP (OR = 1.056, 95% CI: 1.001–1.116), indicating potential roles of electrolyte imbalance and systemic inflammation in malnutrition progression (p < 0.05). The gene discussed is CRP; the disease is Abnormality of metabolism/homeostasis.