Feasibility of NAT for Blood Transfusion

Feasibility of NAT for Blood Transfusion

  • Context:

  • The Supreme Court of India is examining whether blood banks should be mandated to compulsorily conduct the Nucleic Acid Test (NAT) for identifying diseases prior to blood transfusions.

  • The bench is scrutinising the feasibility and cost-effectiveness of this potential mandate.

  • The Supreme Court specifically asked the petitioner to address the cost-effectiveness of shifting from the widespread ELISA test to the highly sensitive NAT.

  • Testing Methods: NAT vs. ELISA

Parameter

NAT

ELISA

In general,

highly sensitive molecular technique

commonly used test for screening blood donations

What it Detects

Viral genetic material (DNA/RNA)

Antigens or antibodies produced against pathogens

Stage of Detection

Detects infection at very early stage (window period is short)

Detects infection after immune response develops (longer window period)

Principle

Molecular amplification techniques (e.g., PCR-based detection)

Antigen-antibody binding reaction with enzyme-mediated color change

Window Period

Very short (reduces risk of transfusion-transmitted infections)

Longer compared to NAT

Sensitivity

Highly sensitive

Less sensitive compared to NAT in early infection

Use in Blood Banks

Used for screening HIV, HBV, HCV to improve blood safety

Traditionally used for screening infectious diseases in blood

Cost

Expensive

Relatively cheaper

Technical Requirement

Requires advanced molecular lab setup

Can be done in standard immunology labs

  • Constitutional Consideration:

  • The petitioner argued that ensuring the supply of safe, infection-free blood to recipients via mechanisms like NAT is a fundamental aspect of the "right to life" guaranteed under Article 21 of the Constitution.

  • About Thalassemia:

  • Thalassemia is an inherited disorder caused by the body's inability to produce enough haemoglobin (the protein transporting oxygen and carbon dioxide).

  • These patients require frequent blood transfusions, heightening their risk of receiving infected blood.

  • As India is the "Thalassemia capital of the world," there is a critical need to standardize blood safety practices to prevent medical mishaps.

  • Recent Incidents:

  • Notably, six children tested HIV-positive in Satna, Madhya Pradesh (December 2025), and five children in Chaibasa, Jharkhand (October last year) following botched transfusions during Thalassemia treatment.