Three tube test for hematuria

What is the three tube test for hematuria?

The three tube test is performed to determine the location of bleeding in the urinary tract.

The three tube test also known as the three container method.

What is Hematuria?

Blood in the urine is Hematuria.

The Blood may be visible in the urine, or it may be identified with a test.

What causes Hematuria?

Hematuria is caused by the below conditions

  • Excessive calcium in the urine
  • Stones in the Kidney
  • Cancer of the urinary tract.
  • Conditions that are passed from parent to child (inherited conditions).
  • Exercise that requires a lot of energy.

How the three tube test is done?

The three tube test is done using three consecutive samples

Three consecutive samples of the urine stream are collected as:

  • 10 to 15 mL of the first urine sample
  • 30 to 40 mL of the midstream urine sample
  • 5 to 10 mL of the last urine sample

What is the procedure of extracting three consecutive samples

Initially the bladder is emptied by passing urine into a series of 3 ounce test tubes

Then, The contents of the first test tube and the last  test tube are examined; 

The first tube contains the washings from the anterior urethra, 

the second test tube comprises of the material from the bladder, and the last test tube constitutes the material from the posterior urethra, prostate, and seminal vesicles

How to understand the results of the three tube test?

The results of the three tube test can be interpreted as Initial hematuria, Terminal hematuria

  1. Initial hematuria
  2. Terminal hematuria
  3. Hematuria in all three samples is seen in lesions that may be anywhere above the bladder neck (bladder, ureters, or kidneys).

Initial hematuria

Hematuria (or predominance of RBCs on urine microscopy) primarily in the first sample

What does the initial hematuria indicate?

The initial hematuria is suggestive of an anterior urethral source of bleeding

Terminal hematuria

What does the terminal hematuria indicate?

Terminal Hematuria primarily at the end of the urine stream is suggestive of a lesion at the bladder trigone (bladder neck) or a posterior urethra.

Terminal hematuria is defined as passage of clear urine with blood or blood-stained urine right at the end of the urine stream (“blood notes just at the end of the urine flow”).

Total hematuria is defined as blood-stained urine throughout the entire duration of the urine flow with no ability to readily differentiate between urine and blood.

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