Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
DU PA Stool Studies
Duke PA Stool Studies
| Question | Answer |
|---|---|
| how does a FOBT work | based on oxidation of guaiac by hydrogen peroxide, resulting in development of a blue color on card when exposed to heme found in stool |
| 3 days prior to FOBT avoid | red meats, >250mg vitamin C |
| 7 days prior to FOBT avoid | NSAIDS/Aspirin (>325) |
| FOBT specimens are ideally innoculated onto card at least __ days prior to developing test | 3 |
| If immediate results are required for FOBT, wait at least __ minutes prior to development | 3-5 |
| causes FOBT false positives | red meats, aspirin, NSAIDS, alcohol, steroids, anticoagulants, chemotherapeutics, iodine preps |
| causes FOBT false positives | vitamin C >250mg/day |
| __ detects presence of leukocytes | methylene blue |
| __ indicative of invasive infective organisms or other inflammatory bowel disorders | fecal leukocytes |
| stool cultures are not routinely __ | gram stained |
| fecal leukocytes will be absent in | norovirus, rotavirus, CMV, ETEC and EHEC, giardia lamblia, Entamoeba histolytica, Cryptosporidium, S. aureus, B. cereus, C. perfringens |
| infectious causes of present fecal leukocytes | shigella, campylobacter, EIEC, Entero, Ivasive E. coli |
| an inflammatory protozoal infection. intact fecal leukocytes may not be seen | Entamoeba hisotlytica |
| an inflammatory viral agent (usually in immunocompromised patients) causes ulceration with viral inclusion bodies within cells on intestinal biopsy | CMV |
| predominant causative enterotoxin for Pseudomembranous colitis | C. difficile toxin A |
| when assessing a patient for C. diff it is the __ that you are looking for | toxin |
| three most commonly screened pathogens in stool cultures | salmonella, shigella, and campylobacter |
| when doing a stool culture a fresh or unpreserved stool should be delivered to the lab in <__ hours | 2 |
| IFA indirect immunofluorescence assay utilizes monoclonal antibodies to identify __ | giardia cysts |
| __ is extrememly sensitive and specific for H. pylori | urea breath test |
| when looking for __ don't send for culture, you look for indirect evidence for the organism | giardia cysts |
| for detection of malabsorption disorders which result in steatorrhea (celiac/tropical sprue, Whipples dz, ZE, Crohn's) used more as a screening tool due to more specific testing for each disorder | fecal fat studies |
| flock of seagulls on gram stain | campylobacter |
| diarrhea acute in onset and persisting for less than 2 weeks is most commonly caused by __ | infectious agents, bacterial toxins, or drugs |
| community outbreaks of diarrhea suggest __ | viral etiology or shared food source |
| day care attendance or exposure to unpurified water may result in infection with | giardia, or cryptosporidium |
| watery, nonbloody diarrhea associated with periumbilical cramps, bloating, nausea, or vomiting suggests __. because tissue invasion does not occur there will be no fecal leukocytes | small bowel source that disrupts normal absorption and secretory processes |
| prominent vomiting suggests __ | viral enteritis or S. aureus food poisoning |
| the presence of fever and bloody diarrhea indicates __ | colonic tissue damage caused by invasion or a toxin |
| diarrhea that originates in the __ is high volume | small intestine |
| diarrhea that originates in the __ is low volume | large intestine |
| organisms that may cause fever and bloody diarrhea from invasion of colon tissue | shigella, salmonella, campylobacter, yersinia or toxins (C. difficile, E. coli O157:H7) |
| organisms that may cause watery non-bloody diarrhea from disruption of small bowel activity | enterotoxigenic E. coli, S. aureus, B. cereus, C. perfringens, giardia |
| a shiga-toxin producing non-invasive organism most commonly acquired from contaminated meat | E. coli O157:H7 |
| watery, nonbloody diarrhea associated with periumbilical cramps, bloating, nausea, or vomiting. fecal leukocytes often not present | noninflammatory diarrhea |
| fever and small volume bloody diarrhea, associated with LLQ cramps, urgency, and tenesmus. fecal leukocytes often present | inflammatory diarrhea |
| if diarrhea worsens or persists for more than 7 days, stool should be sent for __ | fecal leukocytes or lactoferrin determination, ovum and parasite evaluation, and bacterial culture |
Created by:
bwyche
Popular Medical sets