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FAQ category

Calibration Basics FAQ

Read 20 structured questions and answers for healthcare calibration and biomedical documentation planning.

What is calibration?

Calibration is the comparison of an equipment indication or output against a suitable reference standard under defined conditions. The result helps users understand measurement accuracy and whether the equipment meets selected acceptance criteria.

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Why is calibration important?

Calibration supports patient safety, clinical confidence, maintenance planning, audit readiness and reliable equipment history by identifying drift in measured or delivered values.

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Can calibration be performed onsite?

Onsite calibration may be possible when the equipment, method, environment, reference standards and approved scope allow it. Some equipment is better handled in a laboratory.

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Who can issue a calibration certificate?

A competent calibration laboratory or authorised service provider can issue a calibration certificate. NABL-accredited certificates apply only when the activity is within the laboratory's approved scope.

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What is measurement uncertainty?

Measurement uncertainty expresses the doubt associated with a measurement result. It helps users understand confidence in a result and should be considered with acceptance criteria.

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Is calibration mandatory?

Calibration requirements depend on equipment use, risk, manufacturer instructions, hospital policy, accreditation expectations and regulatory requirements. Hospitals usually maintain calibration records for applicable biomedical equipment.

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Does NABH require calibration?

Hospitals preparing for NABH assessment typically maintain calibration records, equipment identification, due-date tracking and preventive maintenance evidence for applicable biomedical equipment.

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How long is calibration valid?

A certificate reports results for the date of calibration. The next due date is normally decided by the customer policy, manufacturer recommendation, risk level and usage history.

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What is calibration drift?

Calibration drift is the gradual change in equipment indication or output over time. It may be caused by age, usage, environment, wear, transport, repair or component changes.

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What is as-found data?

As-found data records the equipment condition before adjustment or corrective action. It helps users understand whether equipment was within limits when received for calibration.

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What is as-left data?

As-left data records the final condition after adjustment, repair or calibration activity. It helps show the state of the equipment when the work is completed.

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What is a calibration interval?

A calibration interval is the planned time between calibration events. It should be based on risk, use, history, manufacturer guidance and the organisation's quality policy.

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Does calibration mean repair?

No. Calibration measures and reports performance. Repair corrects a fault. Equipment may need repair if calibration results show unacceptable performance.

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What is verification?

Verification checks whether equipment meets specified requirements. Calibration may support verification, but verification can include broader checks against acceptance criteria.

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What is traceability?

Traceability links a measurement result to recognised references through an unbroken documented chain of calibrations and standards.

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What is tolerance?

Tolerance is the allowed difference between the measured value and the expected value. It should be defined before pass or fail decisions are made.

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