intro to infections disease

Question 1

CBC with Diff

Answer 1

60-30-6-3-1
mnemonic for middle-range differential values
Neutrophils: present in bacterial infection
Lymphocytes: lymphoma or leukemia
monocytes: chronic infection
esoinophils: parsites, allergins , forgin bacteria
basophils : allergic reations

Question 2

Procalcitonin

Answer 2

> 0.50 infection sensitive
bacterial sensitive
rare increase in viral infections
abscess or loculated infection
mild elevated with tissue damage
esrd

Question 3

blood cult

Answer 3

gold standard

Question 4

Urinary tract infection

Answer 4

clinical diagnosis
not lab dx
nitrate: gram negatives x for pseudomonas
absence is not proof of bacteria

gram +
staphylococcus

urine leukocyte esterase
enzyme by WBC
+ indictive of UTI

Question 5

UA

Answer 5

WBC is not diagnostic of UTI
falsely elevated

low in neutropenia
urine bacteria:
Colonization vs. UTI
not diagnostic

negative leukocyte and nitrate
rules out UTI
positive leukocyte esterase and nitrates
present UTI