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Microhematuria, also called microscopic hematuria (both usually abbreviated as MH), is a medical condition in which urine contains small amounts of blood; the blood quantity is too low to change the color of the urine (otherwise, it is known as gross hematuria).
Microscopic hematuria is sometimes observed in healthy people after exercise [98] or as a consequence of contamination of the sample with menstrual blood. [97] Pathologic causes of hematuria are diverse and include trauma to the urinary tract, kidney stones , urinary tract infections , drug toxicity , genitourinary cancers, and a variety of ...
Hematuria can be classified according to visibility, anatomical origin, and timing of blood during urination. [1] [6]In terms of visibility, hematuria can be visible to the naked eye (termed "gross hematuria") and may appear red or brown (sometimes referred to as tea-colored), or it can be microscopic (i.e. not visible but detected with a microscope or laboratory test).
Asymptomatic bacteriuria generally does not require treatment. [4] Exceptions include those undergoing surgery of the urinary tract, children with vesicoureteral reflux or others with structural abnormalities of the urinary tract. [4] [22] In many countries, regional guidelines recommend treatment of pregnant women. [8]
Most patients with thin basement membrane disease are incidentally discovered to have microscopic hematuria on urinalysis. The blood pressure, kidney function, and the urinary protein excretion are usually normal. Mild proteinuria (less than 1.5 g/day) and hypertension are seen in a small minority of patients.
These presenting symptoms are relatively non-specific and are often seen in other glomerular disorders. Preceding upper respiratory tract infection or post-streptococcal glomerulonephritis may contribute to hematuria, as both have been identified in patients presenting with hematuria in the context of mesangial proliferative glomerulonephritis. [2]
Treatment involves supportive care and may include dialysis, steroids, blood transfusions, or plasmapheresis. [1] [2] About 1.5 per 100,000 people are affected per year. [5] [1] Less than 5% of those with the condition die. [1] Of the remainder, up to 25% have ongoing kidney problems. [1] HUS was first defined as a syndrome in 1955. [1] [8]
The value of urine for diagnostic purposes has been recognized since ancient times. Urine examination was practiced in Sumer and Babylonia as early as 4000 BC, and is described in ancient Greek and Sanskrit texts. [2] Contemporary urine testing uses a range of methods to investigate the physical and biochemical properties of the urine.