Key takeaways
- Standard IVIG is indicated for isoimmune haemolytic anaemia and neonatal allo-immune thrombocytopenia (NAIT); it has no proven benefit as adjunctive therapy for routine neonatal sepsis.
- For isoimmune haemolytic jaundice, give IVIG 500 mg/kg IV over 4 hours when bilirubin rises >8.5 µmol/L/hr despite intensive phototherapy; repeat once after >12 h only if bilirubin keeps rising rapidly.
- For NAIT, give IVIG 1 g/kg/day IV once daily for 1–3 days (platelets <25×10⁹/L, or <50×10⁹/L with severe bleeding despite antigen-negative platelets).
- HBIG 250 units IM must be given within 24 hours of birth (absolute maximum 7 days), alongside the hepatitis B vaccine at a separate injection site.
- VZIG 250 mg IV should be given as soon as possible after varicella exposure (within 72 h antenatal / 10 days postnatal).
Immunoglobulin Use in the Neonatal Period
A Clinical Schematic of Indications, Dosing, and Pathways
Neonatal Immunoglobulins Overview
Neonatal Immunoglobulins
- Standard Human IVIG — Broad immune modulation
- Indications: Isoimmune Haemolytic Anaemia (Jaundice) & Neonatal Allo-immune Thrombocytopenia (NAIT)
- Specific Hyperimmune Globulins — Targeted post-exposure prophylaxis
- Indications: Hepatitis B (HBIG) & Varicella Zoster (VZIG)
Clinical Caveat: IVIG has no proven benefit in substantive trials as an adjunctive therapy for routine neonatal sepsis.
Hematology Protocol: Isoimmune Haemolytic Anaemia (Jaundice)
Hematology Protocol: Isoimmune Haemolytic Anaemia (Jaundice)
- Context: At-Risk Neonate: Rhesus (D, c, C, E, e), Kell, or Duffy incompatibility.
- Intervention: Intensive Phototherapy Active (4 light sources at correct distance).
- Decision: Is Bilirubin rising at >8.5 µmol/L per hour? OR Hb 100-120 g/L with rapidly rising bilirubin close to exchange levels.
- Action: Initiate Standard IVIG — 500 mg/kg, administered via IV over 4 hours.
Repeat Dose? A single repeat dose can be given >12 hours later ONLY if bilirubin continues to rise rapidly.
App Reference: Neofast Medicines Screen
- Medicine: Human immunoglobulin
- Product: Immunoglobulin®
- Route: Intermittent IV
- Concentration: 50mg/mL Solution
- Fields: Weight (kg), Desired dose (mg/kg/dose)
- Additional information / Bibliographical references link available
Neofast App: Dosing Calculation Example
Neofast App: Human Immunoglobulin Dosing Calculation
- Medicine: Human immunoglobulin
- Product: Immunoglobulin®
- Route: Intermittent IV
- Concentration: 50mg/mL Solution
- Weight (kg): 2
- Desired dose (mg/kg/dose): 500
- Suggested dose: 400 to 1000 mg/kg/dose
| Parameter | Value |
|---|---|
| Dose | 1,000mg |
| Interval | AMD |
| Dose | 20mL |
Infusion Rate
| Duration | Volume |
|---|---|
| 30min | 0.6mL |
| 30min | 1.2mL |
| 30min | 1.8mL |
| 30min | 3.6mL |
| 1h50min | 12.8mL |
Note: The infusion rate used was 0.01 mL/kg/min for the first 30 min, followed by 0.02 mL/kg/min for the next 30 min and 0.03 mL/kg/day for another 30 minutes and ending with 0.06 mL/kg/min for the remainder of the dose (as recommended by the manufacturer). The recommended dose in Neofax for isoimmune hemolytic disease is 0.5 to 1 g/kg/dose, which can be repeated in 12 hours AMD; neonatal alloimmune thrombocytopenia is 1 g/kg/dose IV every day for 2 doses and in measles exposure is 400 mg/kg/dose IV within 6 days of…
Hematology Protocol: Neonatal Allo-immune Thrombocytopenia (NAIT)
Hematology Protocol: Neonatal Allo-immune Thrombocytopenia (NAIT)
Context: Severe thrombocytopenia in an otherwise healthy term newborn is NAIT until proven otherwise.
Triggers for IVIG +/- steroids
- Bleeding: Platelet count < 50 x 10^9/L AND severe haemorrhage persists despite antigen-negative platelet transfusion.
- Non-Bleeding: Platelet count < 25 x 10^9/L (whether actively bleeding or not).
Dosing & Administration
- Dose: 1 g/kg/day
- Route: IV
- Duration: Once daily for 1 to 3 days.
Note: May require additional doses 2-4 weeks later due to persistence of maternal antibodies.
App Reference: Neofast Dosing Example
| Parameter | Value |
|---|---|
| Dose | 2,000mg |
| Interval | AMD |
| Dose | 40mL |
Infusion Rate
| Duration | Volume |
|---|---|
| 30min | 0.6mL |
| 30min | 1.2mL |
| 30min | 1.8mL |
| 30min | 3.6mL |
| 4h40min | 32.8mL |
- Medicine: Human immunoglobulin
- Product: Immunoglobulin®
- Route: Intermittent IV
- Concentration: 50mg/mL Solution
- Weight (kg): 2
- Desired dose (mg/kg/dose): 1000
- Suggested dose: 400 to 1000 mg/kg/dose
Infection Prophylaxis: Hepatitis B (HBIG) and Varicella Zoster (VZIG)
Infection Prophylaxis: Hepatitis B (HBIG)
HBIG must be administered within 24 hours of birth (absolute maximum 7 days).
- Timeline: Birth → 24 Hours (solid, required) → 7 days (dashed, absolute maximum)
Given alongside Hep B Vaccine to:
- Low-birth-weight babies (<=1.5 kg) born to a Hep B positive mother (regardless of HBeAg status)
- Babies born to highly infectious mothers.
Dose: 250 units IM
Procedural Note: Use 2 separate injection sites for the vaccine and HBIG. For LBW babies, the 250 unit HBIG dose can be divided into smaller amounts across different sites.
Infection Prophylaxis: Varicella Zoster (VZIG)
| Exposure Type | Trigger | Timing | Dosing Box |
|---|---|---|---|
| Maternal Exposure | Mother develops chickenpox rash 7 days before to 7 days after birth. | Give ASAP (within 72 hours for antenatal exposure; within 10 days for postnatal). | 250 mg (~1.7 mL), Route: IV |
| Non-Maternal Exposure | VZ IgG-negative babies exposed in the first 7 days, OR exposed babies requiring intensive/prolonged care (e.g., <28 weeks or <1 kg) | Give ASAP (within 10 days of exposure) | 250 mg (~1.7 mL), Route: IV |
Alternative Exception: If VZIG is unavailable or IM is contraindicated, give 0.2 g/kg of standard IVIG (Note: this is less effective)
Synthesis: The Bedside Immunoglobulin Matrix & Aftercare Protocols
Synthesis: The Bedside Immunoglobulin Matrix
| Indication | Product | Dose | Route | Timing / Duration |
|---|---|---|---|---|
| Haemolytic Jaundice | Standard IVIG | 500 mg/kg | IV (over 4 hrs) | Single dose (repeat >12h if needed) |
| NAIT | Standard IVIG | 1 g/kg/day | IV | Once daily for 1-3 days |
| Hepatitis B Exposure | HBIG | 250 units | IM | Within 24 hours of birth |
| Varicella Exposure | VZIG | 250 mg | IV | ASAP (within 72h to 10 days) |
Crucial Aftercare & Follow-Up Protocols
Post-IVIG for Jaundice
- Mandatory ongoing neurodevelopmental follow-up.
- Audiology/Hearing test required.
- Check Hb every 2 weeks initially, and until 3 months of age (vital due to the risk of late anaemia).
Post-IVIG for NAIT
- Recheck platelet count 2 weeks post-discharge.
- Note: A subset of babies require a second course of IVIG if maternal antibodies persist.
Post-HBIG for Hep B
- Monitor babies <28 weeks’ gestation for 72 hours post-administration.
- Strict respiratory monitoring required during this window to detect adverse cardiopulmonary events.
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Frequently asked questions
What is the IVIG dose for isoimmune haemolytic jaundice?
500 mg/kg IV over 4 hours, repeatable after >12 h only if bilirubin keeps rising rapidly.
What is the IVIG dose for NAIT?
1 g/kg/day IV once daily for 1–3 days; further doses may be needed 2–4 weeks later if maternal antibodies persist.
When must HBIG be given?
Within 24 hours of birth (absolute maximum 7 days), 250 units IM, with the hepatitis B vaccine at a separate site.
Is IVIG useful in neonatal sepsis?
No — IVIG has no proven benefit in substantive trials as adjunctive therapy for routine neonatal sepsis.
What follow-up is needed after IVIG for jaundice?
Neurodevelopmental follow-up, an audiology test, and Hb checks every 2 weeks until 3 months of age (risk of late anaemia).
