Check bilirubin level against newborn age in hours. Add gestation, weight, and risk factors quickly. Get clear categories and next-step suggestions for clinicians today.
| Case | Age (h) | TSB (mg/dL) | Gestation (w) | Risk factor(s) | Example output |
|---|---|---|---|---|---|
| A | 24 | 9.5 | 39 | None | Moderate zone, routine follow-up |
| B | 36 | 13.2 | 37 | GA < 38 weeks | Near phototherapy level, close follow-up |
| C | 48 | 16.1 | 40 | Bruising | Phototherapy level reached |
| D | 60 | 22.0 | 39 | Hemolysis suspected | Urgent evaluation threshold reached |
Examples are illustrative and may not match your protocol.
Newborn bilirubin changes fast, so age in hours matters more than calendar days. The calculator asks for hours since birth and compares the result to age-specific reference knots from 0 to 168 hours. Linear interpolation estimates a threshold at the exact hour you enter, avoiding abrupt jumps between day-based tables. Physiologic jaundice often peaks around 72–120 hours, so early-hour context is critical.
Hospitals may report total serum bilirubin (TSB) in mg/dL or µmol/L. The tool converts values using 1 mg/dL = 17.1 µmol/L, then performs comparisons in mg/dL. Displaying both units helps when referrals arrive with different lab formats and supports handover communication. Always document whether the value is serum or transcutaneous.
Thresholds are tighter when vulnerability is higher. Gestation below 38 weeks and major factors such as suspected hemolysis, G6PD deficiency, or sepsis are grouped as High tier. Minor factors like bruising or poor intake form Medium tier. The calculator applies an illustrative downward shift to the phototherapy threshold for these tiers to represent earlier action in many protocols. Add weight loss and hydration assessment alongside this tiering.
If you enter a previous TSB and the hours between samples, the tool calculates rate of rise: (TSBnow − TSBprev) ÷ hours. A rising trend near a threshold can justify earlier repeat testing, feeding support, and senior review. A stable or falling trend supports routine surveillance when other risks are absent. Rapid rises are particularly concerning in the first 24–48 hours.
The Plotly chart overlays two curves: a phototherapy reference and a higher exchange-evaluation reference. Your point is plotted at the entered age, making it easier to explain why a value is considered “below,” “near,” or “at” a threshold. This visual framing can improve shared decisions about timing of repeat blood tests. The curve snapshot table lists knot thresholds for verification.
Results include the interpreted status, thresholds at the current age, and a follow-up suggestion. Use CSV for logs and PDF for transfer notes. The calculator is a decision-support aid only; always apply local guidance and escalation pathways.
No. It is a structured helper with illustrative thresholds. Always use your institution’s guideline and clinical judgment for diagnosis, treatment, and escalation decisions.
Enter the current total serum bilirubin if available. If you have a transcutaneous value, follow local rules for when a confirmatory serum test is required, especially near thresholds.
Lower gestational age is associated with higher susceptibility to bilirubin-related complications. Many protocols recommend earlier intervention or closer follow-up for newborns below 38 weeks.
It is the change in bilirubin divided by the time between two measurements. A faster rise can indicate higher risk and may justify earlier repeat testing and senior review, depending on your protocol.
This page focuses on early newborn monitoring (0–168 hours). Persistent jaundice after the first week often needs a different evaluation pathway for prolonged jaundice causes.
No. The exports include only the numerical inputs and computed outputs shown on the page. Keep patient identifiers out of this tool and document officially in your clinical record system.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.