Diagnostic investigations Flashcards

1
Q

What are the main types of investigations?

A

Radiological
Physiological
Pathological

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2
Q

What are investigations for?

A
Diagnosis
Suitability for treatment
Prognosis
Monitoring treatment
Screening
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3
Q

What do the lab need to know about the clinical context?

A
Demographics of patient
Type of specimen
Tests required
Clinical diagnosis
Relevant treatment
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4
Q

What are the 3 sources of error?

A

Pre-analytical - e.g. contamination, wrong tube, mislabelling
Analytical - e.g. machine not calibrated, dilution errors
Post-analytical - e.g. admin error, lack or knowledge or communication

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5
Q

What are the 3 features of microbiology?

A

MCS -

  • Microscopy - see it
  • Culture - grow it
  • Sensitivity - kill it
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6
Q

What colour is gram positive staining?

A

Purple

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7
Q

What colour is gram negative staining?

A

Red

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8
Q

What are the two types of gram staining shapes seen?

A
  • Cocci - circular shape

- Rods

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9
Q

Give examples of gram positive cocci

A

Staphylococcus (MRSA)

Streptococcus

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10
Q

Give examples of gram positive bacilli (rods)

A

Bacillus anthracis
Baccilus Cereus
Listeria
Propionobacterium acnes

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11
Q

Give an example of gram negative cocci

A

Neisseria (gohorrhoea)

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12
Q

Give examples of gram negative rods

A

E. coli
Klebsiella
Pseudomonas
Haemophilus

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13
Q

Give two examples of gram stain “funnies”

A

Vibrios - “comma shaped”

Campylobacter - “seagull shaped”

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