11 results
Summary of Agents Potentially Contributing to False Positives on Urine Drug Screens (UDS)
Marijuana Metabolites
 • dronabinol,
Contributing to False ... levofloxacin, ofloxacin, poppy ... seeds, poppy oil ... (High Rate of False ... DrugScreening #UDS #Testing
False Positive Lung Point on POCUS
Lung-Cardiac Point and Lung-Diaphragm Point
These images highlight selected differentials to pleural
False Positive Lung ... Point on POCUS ... highlight selected differentials ... UAlberta_Sono #False ... #LungPoint #POCUS
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Medications that Can Cause False Positives on Drug Tests

Urine drug screens (UDSs) are simple to use,
that Can Cause False ... Amphetamine false ... Cannabinoid false ... (Benadryl) • Poppy ... #drug #tests #differential
Helicobacter Pylori (H. pylori) Infection - Diagnosis and Management - GrepMed Handbook
Presentation: Dyspepsia / Peptic Ulcer
Ag, Urea Breath Testing ... (UBT) - ↑ false ... hold 2w before testing ... (IgG) - cannot differentiate
1,3-Beta-D-Glucan and Galactomannan Testing Sensitivity Specificity and False Positives
1,3-Beta-D-Glucan
 • Cell wall component of many fungi
Galactomannan Testing ... Specificity and False ... BAL samples • False ... in BAL does not differentiate ... Galactomannan #Fungal #Testing
Causes of Gallbladder Wall Thickening - Differential Diagnosis
 • Physiologic: Contracted gall bladder in a non-fasting
Wall Thickening - Differential ... bladder in a non-fasting ... Gallbladder #Thickening #Differential ... Diagnosis #radiology #POCUS
Fungal Biomarkers: Beta-D-Glucan and Aspergillus Galactomannan
Beta-D-Glucan:
 • Polysaccharide cell wall component of many fungi
 • Pathogens:
breakthrough IFI in HM • False ... BAL GM does not differentiate ... recipients, CGD pts • False ... Frozen ice-pops (in setting
Causes of Inaccurate Fecal Occult Blood Test Results 

False Positive gFOBT:
Ingestion of nonhuman heme (eg, meat
Test Results False ... anticoagulant medication False ... #OccultBlood #Testing ... FalseNegative #Diagnosis #Differential
D-dimer
Plasma D-dimer is a product of clot breakdown, released upon degradation of polymerized, crosslinked fibrin. Elevated
specificity (i.e. more false ... adjusted d-dimer testing ... pathophysiology #hematology #differential
COVID-19 False Negative Score Calculator

CONTACT - Does the patient have a known COVID-19 contact?
OTHER - Does
COVID-19 False Negative ... DIFFERENTIAL - Does ... Coronavirus #SARSCOV2 #Testing