Sample Testing Flashcards

1
Q

Testing process steps

A
  • Receipt of sample
  • Analysis
  • Validation
  • Interpretation
  • Authorisation
  • Reporting
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2
Q

Turnaround time

A

The time taken between receipt and reporting of a sample

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3
Q

Reasons for testing

A
  • To make a diagnosis
  • To identify causes of disease
  • To monitor disease progress
  • To estimate prognosis
  • Determine treatment options
  • Monitor efficacy of treatment
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4
Q

Sensitivity of a test

A

The percentage of people with the disease who have a positive result

TP/[TP+FN] X100

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5
Q

Specificity of a test

A

The percentage of healthy people who have a negative result

TN/[TN+FP] X100

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6
Q

Positive predictive value

A

The percentage of positive results that are true positives

TP/[TP+FP] X100

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7
Q

Negative predictive value

A

The percentage of negative results that are true negatives

TN/[TN+FN] X100

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8
Q

Overall efficiency of a test

A

[TP + TN] X 100 / Total no. of tests

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9
Q

Sources of error

A
  1. Pre-analytical (sample collection)
  2. Analytical (lab errors)
  3. Post-analytical (calculation/reporting errors)
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10
Q

Point of care testing

A

POCT can be carried out at a range of locations, including at home or in hospital

POCT gives rapid results but they are less subject to validation steps

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