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Methylene blue has been used as a placebo; physicians would tell their patients to expect their urine to change color and view this as a sign that their condition had improved. [26] This same side effect makes methylene blue difficult to use in traditional placebo-controlled clinical studies , including those testing for its efficacy as a ...
For this test, the patient takes oral phenazopyridine (Pyridium) 200 mg three times a day, and indigo carmine or methylene blue is filled into the empty urinary bladder via a urethral catheter. Pyridium turns urine orange in the kidneys, and methylene blue (or indigo carmine) turns urine blue in the bladder. [1] A tampon is placed into the ...
Wright's stain is a hematologic stain that facilitates the differentiation of blood cell types. It is classically a mixture of eosin (red) and methylene blue dyes. It is used primarily to stain peripheral blood smears, urine samples, and bone marrow aspirates, which are examined under a light microscope.
Methylene blue may turn it blue to bluish-green. [32] Phenolphthalein , a stimulant laxative previously found in Ex-Lax , [ 33 ] can produce colors ranging from red to purple, and levodopa , used to treat Parkinson's disease , may result in "cola-colored" urine.
Rumours of the origin of urine indicator-dye go back at least as far as 1958, [1] and the story is commonly told to children by parents who do not want them to urinate in the pool. [3] A 1985 biography of Orson Welles describes him using such a dye as part of a prank in 1937.
Eosin methylene blue (EMB, also known as "Levine's formulation") is a selective and differential media used for the identification of Gram-negative bacteria, [1] specifically the Enterobacteriaceae. EMB inhibits the growth of most Gram-positive bacteria. EMB is often used to confirm the presence of coliforms in a sample.
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Blue urine can be caused by the ingestion of methylene blue (e.g., in medications) or foods or beverages with blue dyes. Blue urine stains can be caused by blue diaper syndrome. Purple urine may be due to purple urine bag syndrome. Black or dark-colored urine is referred to as melanuria and may be caused by a melanoma or non-melanin acute ...