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Clin Med Lab > Labs > Flashcards

Labs Flashcards

1
Q

Glucose:

Does pleural effusions have the same concentration as serum

A

Yes

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2
Q

Glucose labs <30 mg/dL is indicative of?

A

Rheumatoid arthritis

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3
Q

A glucose level of 30-50 indicates what type of exudative pleural effusion?

A

Tuberculosis, malignancy, SLE

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4
Q

A pH <7.30 always means that the pleural effusion is?

A

Exudative

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5
Q

A pH <??? is consistent with an esophageal rupture (gastric secretions)

A

6.0

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6
Q

What is the only other cause for a pH <7.0?

A

Collagen vascular disease

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7
Q

Total WBC is almost over never diagnostic.

A WBC >10,000 indicates?

A

Inflammation (pneumonia, pulmonary infarct, pancreatitis, post cardiology)

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8
Q

Total WBC is almost over never diagnostic.

A WBC >50,000 indicates?

A

Parapneumoic effusions, usually empyema

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9
Q

A WBC less than 5000 indicates?

A

Chronic exudates (malignancy or TB)

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10
Q

<1000 WBC is what?

A

Transudates

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11
Q

How many RBC is needed to give red tinged appearance?

A

5000-6000

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12
Q

Greater than >100,000 RBC?

A

Suggests malignancy, pulmonary infarct or trauma,
(Occasionally seen in CHF)

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13
Q

> 100,000 RBC is commonly seen in?

A

CHF

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14
Q

A wright stain differentiates?

A

PMN from mononuclear cells

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15
Q

A wright stain can NOT differentiate the difference between?

A

Lymphocytes and monocytes

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16
Q

LDH is the

A

Light’s criteria

17
Q

You only need to know 1/3 of the LDH light’s criteria in order to be exudative.

LDH is in indicator of tissue breakdown*

A

Pleural fluid/serum protein >0.5

Pleural fluid/serum LDH >0.6

Pleural fluid/serum LDH >2/3 of the upper limit of normal serum LDH

18
Q

LIght’s criteria is specifically for?

A

Exudative

19
Q

For a patient with high suspicion of transudative, but meets Light’s Criteria, Dr. Light recommends a serum/pleural albumin <???? Confirms the effusion is exudative

A

1.2mg/dL

Clin Med Lab (2 decks)

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