Nurse Practitioner Chronicles

  Neonatal Hyperbilirubinemia: Total vs. Direct, the Bhutani Nomogram, and When Jaundice Is Never “Just Physiologic” Direct bilirubin >1.0 mg/dL is always pathologic. Always. No exceptions. Nearly every newborn develops some degree of jaundice. The vast majority is physiologic—a normal consequence of increased bilirubin production from fetal RBC turnover plus immature hepatic conjugation. But buried in that sea of yellow babies are the ones with pathologic hyperbilirubinemia who need urgent phototherapy or exchange transfusion to prevent kernicterus. The labs tell you which is which. Total Bilirubin vs. Direct Bilirubin: Why Both Matter Type Also Called What It Means Clinical Significance Indirect (Unconjugated) Lipid-soluble bilirubin Bilirubin that has NOT been processed by the liver This is the neurotoxic fraction. Crosses the blood-brain barrier. Elevated in hemolysis, physiologic jaundice, breastfeeding/breast milk jaundice, G6PD deficiency. Direct (Conjugated) Water-solubl...

  ASO Titers & Anti-DNase B: When They Matter, When They Don't, and the Jones Criteria Refresher Stop ordering ASO for every sore throat. It's only relevant when you suspect a post-streptococcal complication—not for diagnosing acute pharyngitis. What ASO and Anti-DNase B Measure Both are antibodies against Group A Streptococcus (GAS) antigens. They indicate  prior  streptococcal infection—not current infection. They peak 3–6 weeks after the strep infection and decline over months. ASO (Anti-Streptolysin O) : Rises after pharyngeal GAS infection. Peaks at 3–5 weeks. More sensitive for post-pharyngitis complications (ARF, PSGN). Anti-DNase B : Rises after both pharyngeal AND skin GAS infections. Peaks at 6–8 weeks. More sensitive for post-skin-infection complications (especially PSGN after impetigo). Stays elevated longer than ASO. The #1 Misuse ASO should NOT be ordered to diagnose acute strep pharyngitis.  The rapid strep test and throat culture are the tests for...