Lower back pain, painful and frequent urination, a feeling of discomfort or heaviness in the lower abdomen, a change in the color and transparency of urine are common signals by which the body reports possible problems in the functioning of the kidneys or urinary tract. Similar manifestations occur in many different pathologies - from mild inflammation to chronic diseases. To find out the exact cause of the complaints, the doctor prescribes a complex of laboratory and instrumental studies, among which the Nechiporenko urine test is of great importance. Diagnostics allows you to assess the condition of the kidneys, detect signs of inflammation or infection at an early stage and select effective therapy.
What tests are prescribed if kidney and urinary tract diseases are suspected?
The doctor selects the list of examinations individually depending on the severity of the symptoms and the expected diagnosis.
The basic set of laboratory and instrumental studies usually includes:
- A complete urinalysis (CUR) is a basic screening test that evaluates the physicochemical properties of urine (color, transparency, density) and the presence of protein, glucose, leukocytes, erythrocytes, bacteria, and salts.
- Nechyporenko urine analysis – used to clarify the results of a general urine analysis and quantify individual cellular elements.
- Bacteriological urine culture (bacteriological culture) - performed when a bacterial infection is suspected to identify the pathogen and determine its sensitivity to antibiotics.
- Blood tests (biochemical and general) - are prescribed to assess kidney function (levels of creatinine, urea, uric acid) and detect general signs of inflammation.
If there are indications or based on the results of the interpretation of the urine analysis according to Nechiporenko, the doctor may refer you for an ultrasound of the kidneys and bladder. This is an instrumental examination that helps visualize the structure of the urinary system organs and detect calculi, neoplasms, and anatomical changes.
What does a Nechiporenko urine test show and when is it prescribed?
Nechyporenko urine analysis is a laboratory method, the essence of which is the accurate quantitative determination of leukocytes, erythrocytes, and cylinders in 1 ml of urine.
Each of the indicators has its own meaning for the doctor:
- Leukocytes are cells of the immune system. A significant deviation from the norm of leukocytes in the urine indicates an existing inflammatory process in the kidneys or urinary tract.
- Erythrocytes are red blood cells. Their number increases if blood enters the urine from the kidneys or urinary tract.
- Casts are protein “casts” of the renal tubules. Their appearance indicates that changes may have occurred at the kidney level.
Unlike general analysis, where sediment elements are evaluated in the field of view of a microscope, Nechiporenko analysis provides a calculated absolute indicator.
The doctor may order the test if:
- a significant deviation from the norm was detected in the general urine analysis;
- it is necessary to clarify the results of previous studies;
- it is necessary to track the dynamics of indicators or monitor the effectiveness of treatment;
- there is a suspicion of inflammation or infection of the urinary tract or kidneys.
Important! The Nechiporenko test is not an independent tool for establishing a final diagnosis. Its results are considered only in conjunction with other clinical and laboratory data.
How to prepare for a Nechyporenko urine test and avoid mistakes
To ensure the results of tests for kidney diseases are as accurate as possible, you should properly prepare for the test. Before collecting urine, you should thoroughly clean the external genitalia without using aggressive detergents and antiseptics, and then wipe them dry with a clean towel.
Usually, morning urine is used for analysis. The first small portion is released into the toilet, after which, without stopping urination, an average portion of approximately 20-50 ml is collected into a sterile disposable container. The last part of the urine is also released into the toilet. After collection, the material should be delivered to the laboratory within 1-2 hours. The container should be stored at room temperature, avoiding overheating or freezing. Failure to comply with the terms or conditions of transportation may lead to cell destruction and distortion of the results.
In infants and young children, collecting a medium portion can be difficult. Therefore, special pediatric urine collectors are used.
Particular attention should be paid to the following points:
- Menstruation. It is not recommended to take the test during menstruation, as blood getting into the sample will give a false-positive result for red blood cells.
- Intense physical activity on the eve of the test may be accompanied by a temporary increase in the number of erythrocytes or casts.
Failure to follow the rules for preparing and collecting biomaterial may lead to inaccurate results and the need for repeated testing.
Urine analysis standards for Nechyporenko and causes of deviations
Laboratory norms are calculated per 1 ml of collected biomaterial. Below are standard reference values and possible causes of deviation from the norm.
Urinalysis according to Nechiporenko is an important additional method of laboratory diagnostics, which helps to clarify the results of a general urine analysis and identify signs of an inflammatory process in the kidneys and urinary tract. At the same time, even a deviation from the reference values does not always indicate a specific disease. For a correct assessment of the results, it is important to take into account the patient's complaints, clinical picture and results of other examinations. It is a comprehensive approach that allows you to establish the cause of the changes and determine further treatment tactics.
| Indicator | Reference values (in 1 ml) | Possible reasons for the increase |
|---|---|---|
| Leukocytes | Before 2000 | Infectious-inflammatory processes (pyelonephritis, cystitis, urethritis, prostatitis), stones, improper sample collection. |
| Erythrocytes | Up to 1000 | Glomerulonephritis, urolithiasis, urinary tract injuries, tumor processes, taking certain medications, menstruation, poor hygiene when collecting urine, physical exertion before the analysis. |
| Cylinders (hyaline) | Up to 20 | Damage to kidney tissue (parenchyma), toxic or congestive phenomena in the kidneys, fever, significant physical exertion, dehydration. |
Note: granular, waxy, erythrocytic, leukocyte, epithelial, and fat casts are normally absent.
Important: units of measurement and reference ranges depend on the laboratory's methodology and equipment. Therefore, results should be compared with the standards specified in the specific laboratory's form. For children and pregnant women, ranges may differ. Deviations from reference values are not specific to any one disease and require clinical interpretation.
What to do if there are abnormalities in the results of your urine analysis
If the test results are outside the reference range, do not jump to conclusions. An increase in one indicator does not always mean a specific disease. Changes can be caused by errors in urine collection, temperature, stress, and medication. Therefore, the doctor evaluates laboratory indicators in conjunction with the patient's symptoms and complaints, the data of a general urine analysis and blood biochemistry, and the results of instrumental examinations.
If necessary, a therapist or urologist may prescribe additional examinations:
- bacteriological urine culture ;
- general and biochemical blood tests;
- ultrasound examination of the kidneys and bladder;
- repeated urine analysis according to Nechiporenko or other laboratory tests .
Important! You should not self-diagnose and start treatment based on only one test result. An accurate conclusion can only be made after a comprehensive assessment of the examination results and consultation with a doctor.