14 results
Causes of False Elevation and Reduction in HbA1c

== False Elevation ==
Decreased RBC turnover 
• Iron, B-12,
Causes of False ... in HbA1c == False ... • Asplenia Laboratory ... Transfusions == False ... Transfusions #False
Summary of Agents Potentially Contributing to False Positives on Urine Drug Screens (UDS)
Marijuana Metabolites
 • dronabinol,
Contributing to False ... (High Rate of False ... NSAlDs resulting in false-positive ... not result in false ... #UDS #Testing #Laboratory
1,3 Beta-D-Glucan and Galactomannan - Pathogens, and Testing Characteristics
1,3 ß-D-glucan:
 • Most fungi excluding mucor and
and pneumocystis False ... other fungi • False ... #Specificity #Laboratory
Hepatitis B Virus Serology and Interpretation
HBsAg - Anti-HBs - Anti-HBc - HBeAg - Anti-HBe
 - Acute
(immunity) - False-positive ... Interpretation #diagnosis #laboratory
Urine Drug Screens - Common drugs that may cause false positive tests 

Amphetamines:
Bupropion, Labetalol, Methylphenidate, Phenylephrine,
that may cause false ... DrugScreens #UDS #Laboratory
Lab patterns seen in Inborn Errors of Metabolism

A table of lab values compiled from UpToDate and
metabolicemergency-pathophysiology-differential-pediatrics-metabolism-algorithm-diagnosis ... #Neonatology #Peds ... Genetics #IEM #Laboratory
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 ... Conditions #RPR #False ... diagnosis #syphilis #laboratory
Agents Causing Potential False-Positive Results With Urine Drug Screening 

#Urine #DrugScreens #UDS #Laboratory #Toxicology #Diagnosis #FalsePositive
Causing Potential False-Positive ... DrugScreens #UDS #Laboratory
1,3-Beta-D-Glucan and Galactomannan Testing Sensitivity Specificity and False Positives
1,3-Beta-D-Glucan
 • Cell wall component of many fungi
Specificity and False ... BAL samples • False ... mold-active AF • False ... FalsePositives #Laboratory
Causes of Hematuria - Differential Diagnosis Algorithm
Red blood cells on urine microscopy. Must exclude false positives
Differential Diagnosis Algorithm ... Must exclude false ... Differential #Diagnosis #Algorithm