Why is a first voided morning specimen preferred for performing a microscopic examination of urine quizlet?

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Why is the first voided morning specimen often preferred for urine testing?
Why is the first voided urine sample the most desirable specimen for routine urinalysis?
Why is a first morning urine specimen preferred for urine cultures quizlet?
Why is the first voided specimen desired?

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Cloudiness in a freshly voided specimen may be the result of the presence of bacteria, pus, blood, fat,yeast, sperm, mucous thread, fecal contamination.

Normal color ranges from colorless to dark yellow.
Dilute urine is a lighter yellow meaning less dissolved substances are present
First-morning specimen is darker due to more dissolved substances are present.
Color of urine is caused by urochrome a breakdown of hemoglobin.
Classification of color are:
Light yellow
Yellow
Dark yellow
Light amber
Amber
Dark Amber
Some foods and medications may alter the color of the urine.
Red/Pink: Beets, blackberries, Rifampin, Pyridium (AZO)
Orange: Sulfasalazine, Laxatives, Chemotherapy
Blue/Green: Amitriptyline, Indomethacin, Pseudomonas infection & hypercalcemia
Dark Brown/Tea Colored: Aloe, Flagyl, Methocarbamol, Antimalarial, muscle injury
Purple: Gram-negative bacteria
Apperance
Cloudiness on a freshly collected specimen may be the result of the presence of bacteria, pus, blood, fat, yeast, sperm, mucous threads or fecal contaminants.
uMicroscopic exam of sediment may be useful in dx
uCloudiness can be a result from bacteria caused by a UTI
uClassification of appearance include:
uClear
uSl. Cloudy
uCloudy
uVery cloudy (turbid)
ODOR:
Freshly voided specimen should have a slightly aromatic odor.
uUrine has been standing for a long time develops ammonia odor due to the bacteria breakdown.
uDM pts may have a fruity odor to urine
uUTI may have a foul smelling odor
uFoods such as asparagus can also cause an odor
uOdor is not typical for the dx of pt condition

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Why is the first voided morning specimen often preferred for urine testing?

The first urine voided in the morning is preferred because it has a more uniform volume and concentration and a lower pH, which helps preserve the formed elements. If it is not possible to obtain a first morning sample, the time of the sample should be noted on the test request form and in the patient's records.

Why is the first voided urine sample the most desirable specimen for routine urinalysis?

The first voided morning specimen is particularly valuable because it is more concentrated and abnormalities are easier to detect. An early morning specimen is also relatively free of dietary influences and changes due to physical activity.

Why is a first morning urine specimen preferred for urine cultures quizlet?

The first-voided morning urine specimen is the most desirable for chemical and microscopic analysis because it is the most concentrated specimen of the day.

Why is the first voided specimen desired?

First voided specimen: Sample also referred to as a first morning specimen. This sample is collected the first time the patient urinates in the morning. A first voided specimen is the most concentrated and is the preferred specimen for pregnancy testing, bacterial cultures and microscopic examinations.