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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).
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).
Most patients have been reported to have gross or microscopic hematuria. [8] Significantly increased serum lactate dehydrogenase levels and proteinuria may also be observed. [7] Renal angiography is still the gold standard, but CT renal angiography, CT angiography, and DMSA radioisotope scan can also be used to establish the diagnosis. [4]
Researchers have hypothesized that the syndrome may be due to blood vessel diseases of the kidney, spasms of the kidney vessels, or other bleeding disorders (coagulopathy). The hematuria in LPHS may be due to an abnormal (thick or thin) glomerular basement membrane. The glomerular basement membrane is a tissue in the kidney that filters the blood.
A smaller proportion (20–30%), usually the older population, have microscopic hematuria and proteinuria (less than 2 gram/day). These patients may be asymptomatic and only picked up due to urinalysis. Hence, the disease is more commonly diagnosed in situations where screening of urine is compulsory (e.g., schoolchildren in Japan). [citation ...
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 ...
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.
By contrast, nephrotic syndrome is characterized by proteinuria and a constellation of other symptoms that specifically do not include hematuria. [6] Nephritic syndrome, like nephrotic syndrome, may involve low level of albumin in the blood due to the protein albumin moving from the blood to the urine. [7]
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