Hematuria Flashcards
What can cause a false positive on a urine dipstick test?
Alkaline urine (>9.0) Contamination with oxidizing agents used to clean perineum
What can cause a false negative on a urinary dipstick test?
Presence of formalin
High urinary ascorbic acid
What level of hematuria is considered abnormal in adults? Children?
Adults: 2 RBC’s / high power field
Children: 5 RBC’s / high power field
What is the most frequent cause of hematuria?
Transient, unexplained hematuria
If you spin down the urine and the supernatant is red, what does that tell you?
NOT hematuria. Need to dipstick for heme.
What are three things that can cause red supernatant with a negative dipstick test?
Porphyria
Phenazopyridine
Beets
What is the chemical responsible for red urine with beets?
Betalaine
If somebody’s urine is positive for betalaine, what could be an underlying issue?
Anemic
Achlorhydric (pernicious anemia)
Diet rich in oxalate
If the supernatant of urine is red and positive for dipstick iron, what is the molecule suspended in the urine?
Hemoglobin
If a patient has hematuria and history of upper respiratory tract infection, what is most likely the problem?
IgA nephropathy
If a patient has hematuria and history of pyuria and dysuria, what is most likely the problem?
Infection
If a patient has hematuria and history of flank pain with groin radiation, what is most likely the problem?
Nephrolithiasis
If a patient has hematuria and history of hesitancy and dribbling, what is most likely the problem?
Prostatism
If a patient has hematuria and history of cyclic hematuria, what is most likely the problem?
Endometriosis
If a patient has hematuria with coca cola colored urine, dysmorphic red cells, or proteinuria, is the issue glomerular or extraglomerular?
glomerular
