Ice Lined Refrigerator (ILR) cabinet temperature to be maintained between :

IGNOU PB. Bsc. Nsg. Entrance-2025

Community Health Nursing

Easy

Appeared in: IGNOU PB. Bsc. Nsg. Entrance-2025

Explanation

The standard and correct temperature range for an Ice Lined Refrigerator (ILR) used for vaccine storage is +2°C to +8°C.
This temperature range is optimal for preserving the potency of most vaccines used in the Universal Immunization Programme (UIP), preventing damage from both heat and freezing.
ILRs are specifically designed with an ice lining to maintain this temperature range even during power outages, a feature known as 'hold-over time'.
This equipment is a critical link in the cold chain at district and Primary Health Centre (PHC) levels.

Option B: This range is unnecessarily restrictive. While it falls within the safe zone, the standard accepted upper limit for vaccine refrigerators is +8°C.
Option C: This is a sub-zero temperature range. It would cause freeze-sensitive vaccines like DPT, Pentavalent, and Hepatitis B to freeze and lose their efficacy permanently.
Option D: Similar to the option above, this is a freezing temperature range that is unsuitable for an ILR, which stores a variety of vaccines, many of which are sensitive to freezing.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Temperature maintenance for Ice Lined Refrigerators (ILR) in the vaccine cold chain as background academic context rather than a clinical decision trigger.
A nurse's primary responsibility is to maintain the vaccine cold chain by monitoring and recording the ILR temperature twice daily (morning and evening) in a temperature log book. This ensures vaccine safety and efficacy.
Any deviation from the +2°C to +8°C range must be reported immediately, and corrective actions must be taken to prevent vaccine wastage.
What if? If the temperature log shows a reading of +1°C, the nurse must immediately check for signs of freezing, gently shake the vials to perform a 'shake test' on freeze-sensitive vaccines, and report the temperature breach. The vaccines should not be used until their viability is confirmed by a supervisor.

How to Approach the Question

First, identify the key term in the question: 'Ice Lined Refrigerator (ILR)'. This is a specific piece of equipment with a defined function.
Recall the basic principles of the vaccine 'cold chain'. This system uses both refrigerators and freezers, which operate at different temperatures.
Recognize that refrigerators are used to keep things cool (above freezing), while freezers maintain sub-zero temperatures.
Eliminate the options with negative temperatures (-2°C to -8°C and -2°C to -6°C), as these are freezing ranges suitable for a Deep Freezer, not an ILR that stores freeze-sensitive vaccines.
Between the two positive ranges, recall that the standard, universally accepted temperature for vaccine refrigeration is +2°C to +8°C. This makes it the most accurate and complete answer.

Concept Tested & Keywords

Concept Tested: Temperature maintenance for Ice Lined Refrigerators (ILR) in the vaccine cold chain.
Stem keywords: Ice Lined Refrigerator, ILR, cabinet temperature
Lead-in keywords: maintained between
Negative lead-in flag: false

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E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart A (pp 26-201 of 604) p. 104-106