Siamak N. Nabili, MD, MPH
Dr. Nabili received his undergraduate degree from the University of California, San Diego (UCSD), majoring in chemistry and biochemistry. He then completed his graduate degree at the University of California, Los Angeles (UCLA). His graduate training included a specialized fellowship in public health where his research focused on environmental health and health-care delivery and management.
William C. Shiel Jr., MD, FACP, FACR
Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.
In this Article
- What is a urinalysis?
- What can urinalysis results show?
- Who is involved in the interpretation of urinalysis?
- What types of doctors perform urinalysis?
- What does urinalysis involve?
- What is macroscopic urinalysis?
- What is urine dipstick chemical analysis?
- What are the pros and cons of dip sticks?
- What is microscopic urinalysis?
- How is microscopic urinalysis done?
- What kind of cells can be detected?
- What can the presence of red blood cells in the urine mean?
- What can the presence of white blood cells in the urine mean?
- Other than urinalysis, what are other common urine tests available?
What is urine dipstick chemical analysis?
Urine dipstick is a narrow plastic strip which has several squares of different colors attached to it. Each small square represents a component of the test used to interpret urinalysis. The entire test strip is dipped in the urine sample and color changes in each square are noted. The color change takes place after several seconds to a few minutes from dipping the strip. If read too early or too long after the urinalysis strip is dipped, the results may not be accurate.
Each color change on a particular square may indicate specific abnormalities in the urine sample caused by a certain chemical reaction. The reference for color changes is posted on the plastic bottle container of the urine test strips. This makes for easy and quick interpretation of the urinalysis results by placing the strip next to the container and comparing its color changes to the reference provided.
The squares on the dipstick represent the following components in the urine:
- specific gravity (concentration of urine),
- acidity of the urine (pH),
- protein in the urine (mainly albumin),
- glucose in the urine (sugar),
- ketones (products of fat metabolism),
- blood in the urine,
- leukocyte esterase (suggestive of white blood cells in urine),
- nitrite (suggestive of bacteria in urine),
- bilirubin (possible liver disease or red blood cell breakdown), and
- urobilinogen (possible liver disease).
Presence or absence of each of these color changes on the strip provides important information for clinical decisions.
After the UA test strip is dipped in urine briefly and completely, the reading is done within a few minutes. Each one of the squares on the box has next to it the time which is recommended for its interpretation (for example, whether these is a change in color on the square). The squares are placed in similar order on the box, from the ones requiring the shortest time to read of 30 seconds to the ones with the longest time to read of two minutes. This arrangement is based on result time and makes it easier to quickly read and interpret any color changes by simply scanning the strip from the shortest (glucose) to the longest (leukocytes).
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