The serum concentrations of pregnancy-related hormones (estrogen and progesterone), vitamin D, inflammatory biomarkers (C-reactive protein, fibrinogen, white blood cell count, neutrophil count, lymphocyte count, and ferritin), hematological parameters indicative of anemia (hemoglobin, hematocrit, red blood cell count, and ferritin), thyroid hormones (TSH, FT3, and FT4), coagulation markers (D-dimer, platelet count, fibrinogen, APTT, and INR) were evaluated with the presence of postpartum depression. Here, CRP is linked to postpartum depression.