In plain words
Procalcitonin is a protein made in the body that rises in response to . It is measured with a blood test. In newborns and young infants, a fever can come from a virus or from a serious bacterial infection, and the two can be hard to tell apart. Doctors use several tests together, including a urine test, a blood count, and sometimes procalcitonin, to judge how likely a serious infection is. No single test settles the question. A test result never replaces a physical exam. For parents, the lesson is that a fever in a young baby is taken seriously and checked in person. Call your pediatrician or go to the emergency room right away for any .
The deeper version
Procalcitonin is the precursor of calcitonin that is produced widely during systemic bacterial inflammation and is suppressed by viral infection, making it a biomarker of bacterial sepsis. In febrile infants, the PECARN study (Kuppermann and colleagues, JAMA Pediatrics, 2019) enrolled 1,821 infants 60 days or younger at 26 emergency departments and found serious bacterial infection in roughly 9 percent. The derived low-risk rule combined a negative urinalysis, an absolute neutrophil count of 4,090 per microliter or less, and procalcitonin below a set threshold. Its incremental value over clinical assessment and other markers is debated, and assay thresholds vary between laboratories. The main controversy concerns how to apply such rules to infants at the youngest ages, where sensitivity is most important.
Where it comes up
- Fever in a newborn is an emergencyBaby Basics
- When to call the pediatrician (and when to go in)Baby Basics
- Newborn jaundiceBaby Basics
- Newborn sleep and safe sleepBaby Basics
What mothers here say about procalcitonin
No one has posted under this term yet.
Sources
- Kuppermann N et al. — Identifying serious bacterial infections in infants aged 60 days or younger: the PECARN prospective cohort study. JAMA Pediatrics (2019)
- American Academy of Pediatrics — Clinical practice guideline: evaluation and management of well-appearing febrile infants 8 to 60 days old (2021)