What this test measures
Neonatal samples (heel-prick filter paper or cord blood) are run on cellulose acetate electrophoresis (or HPLC). Newborn Hb is dominated by HbF (~70-80%) with smaller HbA. Pattern interpretation differs from adult — looking for HbS, HbC, HbE alongside HbA + HbF. The Sickle Cell Mission targets newborn screening in endemic states for early identification and parental counselling.
Why it matters
Sickle cell disease affects ~3-5% of children in endemic Indian tribal regions (Madhya Pradesh, Chhattisgarh, Maharashtra, Odisha) and Kerala. Early identification through newborn screening allows: (1) Penicillin prophylaxis from 2 months (prevents pneumococcal sepsis). (2) Family counselling. (3) Early vaccination (pneumococcal, meningococcal, Hib). (4) Hydroxyurea therapy planning. (5) Pain crisis management. Without screening, SCD often presents later with severe pain crisis, splenic sequestration, or stroke.
How to prepare
Heel-prick blood on filter paper card (most common in screening programmes), or cord blood at delivery, or routine venous EDTA sample. No special preparation. Disclose any blood transfusion (donor Hb confounds — test cord blood or pre-transfusion).
Markers & reference ranges
Reference ranges below are typical adult values. Your lab's reported range may differ slightly based on the assay platform and patient demographics — always read your report against the range printed on it.
| Marker | Normal range | If low | If high |
|---|---|---|---|
| HbF (Newborn) (%) | Newborn 60-80% | Below normal newborn range — uncommon; consider beta-globin disorder or alpha-thalassemia. | Above range — usually beta-thalassemia major (very low HbA) or hereditary persistence of fetal Hb. |
| HbA (Newborn) (%) | 20-40% | Reduced HbA + presence of HbS → sickle cell disease. Severely reduced HbA + dominant HbF → beta-thalassemia major. | High HbA — unusual in newborn (HbA rises after birth as HbF declines). |
| HbS (Newborn) (%)[1] | 0 (absence) | 0% — no sickle gene. | Present + HbA: Sickle cell trait (AS). Present + no HbA: Sickle cell disease (SS). Need follow-up at 6-12 months to confirm pattern as HbF declines. |
Common neonatal Hb patterns
| Pattern (newborn) | HbA | HbF | HbS | Likely diagnosis |
|---|---|---|---|---|
| FA (normal) | 20-40% | 60-80% | 0 | Normal |
| FAS | 15-30% | 60-75% | 5-15% | Sickle cell trait |
| FS | 0 | 70-90% | 10-30% | Sickle cell disease (need confirmation) |
| F only | 0 | 90-100% | 0 | Beta-thalassemia major (needs confirmation) |
| FAE / FE | Reduced | High | 0 | HbE present — variant disease |
Frequently asked questions
Why screen newborns for sickle cell?
Untreated sickle cell disease has high morbidity in early childhood — pneumococcal sepsis (preventable with penicillin from 2 months), splenic sequestration (preventable with parental education), stroke. Early diagnosis enables life-saving prophylaxis.
What is the National Sickle Cell Mission?
Launched in 2023, targets premarital + antenatal + neonatal screening in tribal-belt states (MP, CG, Odisha, Maharashtra, Jharkhand, AP, Telangana, Karnataka, Gujarat) with aim of zero sickle cell births by 2047.
Will all babies get screened?
Currently only in endemic regions and select states. Universal newborn screening is the goal. Privately, parents in endemic-area communities should ask for screening.
What's next after positive screening?
Repeat electrophoresis at 6-12 months (as HbF declines) confirms the pattern. Genetic counselling for family. Penicillin prophylaxis from 2 months for SCD. Vaccination per IAP recommendation.
Why electrophoresis instead of HPLC?
HPLC is sensitive and quantitative — preferred where available. Filter-paper cellulose acetate electrophoresis is widely used in field-based screening programmes due to portability and cost.
Related Histopathology / Cytology tests
Tests commonly ordered alongside NEONATAL HEMOGLOBIN ELECTROPHORESIS, or that help interpret an unexpected result.
Sources & references
- ICMR — Sickle Cell Mission Neonatal Screening · accessed 2026-05-30T00:00:00.000Z
- BSH — Neonatal Haemoglobinopathy Screening · accessed 2026-05-30T00:00:00.000Z
- WHO — Sickle Cell Disease · accessed 2026-05-30T00:00:00.000Z
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