22 results
Misinterpretation of Urine Toxicology Screen - False Positives and Negatives

Dr. Y. Jay Lin @JayLin3455

#Urine #Toxicology #UTox
Misinterpretation ... of Urine Toxicology ... Screen - False ... JayLin3455 #Urine ... Toxicology #UTox #False
Summary of Agents Potentially Contributing to False Positives on Urine Drug Screens (UDS)
Marijuana Metabolites
 • dronabinol,
Contributing to False ... Positives on Urine ... (High Rate of False ... FalsePositives #Urine ... DrugScreening #UDS #Testing
Cushing Syndrome Testing Algorithm
INDICATIONS FOR TESTING:
 • Suspected Cushing syndrome (central obesity, muscle weakness, refractory hypertension)
Testing:
Algorithm INDICATIONS ... FOR TESTING: • ... Cortisol, Free Urine ... Serum (or Cortisol Urine ... Syndrome #diagnosis #algorithm
Causes of Proteinuria - Differential Diagnosis Algorithm
Persistent Proteinuria >150mg/d protein present on repeat testing including overnight
Differential Diagnosis Algorithm ... present on repeat testing ... including overnight testing ... Proteinuria (Negative urine ... Differential #Diagnosis #Algorithm
Urine Drug Screens - Common drugs that may cause false positive tests 

Amphetamines:
Bupropion, Labetalol, Methylphenidate, Phenylephrine,
Urine Drug Screens ... that may cause false ... Diphenhydramine #Urine ... FalsePositive #Testing
Hypophosphatemia - Measurement of urine phosphate excretion - Differential Diagnosis Algorithm
 • GI loss
 • Redistribution
Measurement of urine ... Differential Diagnosis Algorithm ... Primary Renal PO4 wasting ... Hypophosphatemia #urine ... Differential #Diagnosis #Algorithm
Hematuria Workup and Diagnosis Algorithm
 • Confirm hematuria → Urinalysis >3 RBCs/HPF, exclude mimics, repeat testing
and Diagnosis Algorithm ... mimics, repeat testing ... WBCs, or urine ... → Urine culture ... Hematuria #Diagnosis #Algorithm
Hyponatremia Differential Diagnosis Algorithm - Utilizing Uric Acid 
ADH promotes Urea/uric acid excretion along with water
Differential Diagnosis Algorithm ... Osmolarity 2) Urine ... Osmolarity 3) Urine ... Acid → renal salt wasting ... Differential #Diagnosis #Algorithm
Agents Causing Potential False-Positive Results With Urine Drug Screening 

#Urine #DrugScreens #UDS #Laboratory #Toxicology #Diagnosis #FalsePositive
Causing Potential False-Positive ... Results With Urine ... Screening #Urine ... FalsePositive #Testing
Diagnostic algorithm for the workup of hypercalcemia. The diagnostic workup for patients presenting with hypercalcemia rests
Diagnostic algorithm ... Urine calcium-creatinine ... from a 24-hour urine ... Thus, further testing ... #Differential #Algorithm