2157 results
Diagnostic Algorithm for Dizziness and Vertigo
Peripheral Vertigo:
 • Attacks: Sudden, severe, can last anywhere from seconds
Diagnostic Algorithm ... with vascular causes ... positional episodes caused ... test (posterior ... #differential #diagnosis
Whipple Disease (Tropheryma whipplei) - Diagnosis and Management 

Caused by: Tropheryma whipplei

Symptoms and Signs:
1. Migratory poly/oligoarthralgia
Tropheryma whipplei) - Diagnosis ... Management Caused ... diarrhea (75%) Diagnostic ... T. whipplei tests ... T. whipplei test
Medications that Can Cause False Positives on Drug Tests

Urine drug screens (UDSs) are simple to use,
Medications that Can Cause ... on Drug Tests ... medications can cause ... on drug tests? ... #diagnosis #toxicology
Causes of Secondary Hypertension - Differential Diagnosis and Screening Testing
Common causes: 
 • Renal parenchymal disease
- Differential Diagnosis ... Renal ultrasound, Tests ... sodium loading test ... conditions (supine position ... #Differential #Diagnosis
The head impulse test (HIT) result is positive (abnormal) in nearly all patients with a peripheral
The head impulse test ... HIT) result is positive ... with a peripheral cause ... with a central cause ... #Diagnosis #PhysicalExam
RPR - False Positives
Causes of a false positive RPR that are not syphilis. (False-negative treponemal tests
RPR - False Positives ... Causes of a false ... False-negative treponemal tests ... are rare; case ... #differential #diagnosis
Strabismus - Ocular Misalignment - Differential Diagnosis Algorithm
Phoria:
 • Latent deviation
 • Symmetrical corneal light reflex,
- Differential Diagnosis ... positive cover/ ... light reflex, • Positive ... #Differential #Diagnosis ... #Algorithm #Causes
Causes of Inaccurate Fecal Occult Blood Test Results 

False Positive gFOBT:
Ingestion of nonhuman heme (eg, meat
Causes of Inaccurate ... Fecal Occult Blood Test ... Results False Positive ... medication False Positive ... FalseNegative #Diagnosis
USMLE Epidemiology and Biostatistics Summary
Meta-Analysis: pools data from several studies (greater power), limited by quality/bias of
positive: TP / ... 100%, then all positive ... proportion of positive ... true positives: ... #calculations #diagnosis
Urine Drug Screens - Common drugs that may cause false positive tests 

Amphetamines:
Bupropion, Labetalol, Methylphenidate, Phenylephrine,
drugs that may cause ... false positive ... tests Amphetamines ... Laboratory #Toxicology #Diagnosis