The Midstream Specimen of Urine (MSU) station is an important part of the Nursing and Midwifery Council (NMC) Objective Structured Clinical Examination (OSCE). This station assesses a candidate’s understanding of urine specimen collection and the clinical significance of urine analysis. Candidates should understand not only why a urine sample is collected but also how urine dipstick findings can provide useful information about a patient’s health.
During the NMC OSCE, candidates may encounter an 8SG urine dipstick strip containing eight parameters: leukocytes, nitrites, protein, pH, blood, specific gravity, ketones and glucose. Each parameter provides different information about possible urinary tract infection, kidney function, hydration status and metabolic conditions, including diabetes.
Although candidates may not be required to interpret complex laboratory reports, they should understand the common urine components, what abnormal findings may indicate and why these findings matter in nursing practice.
At Mentor Merlin, we encourage candidates to prepare for the MSU station by understanding both the practical procedure and the clinical knowledge associated with urine analysis. This knowledge helps candidates communicate confidently, provide appropriate patient education and demonstrate safe, patient-centred nursing care.
1. What Is the MSU Station in the NMC OSCE?
MSU stands for Midstream Specimen of Urine. It refers to a urine sample collected from the middle part of the urine stream for examination.
Urine testing can help healthcare professionals investigate urinary symptoms and identify abnormalities that may require further assessment. Depending on the clinical situation, urine analysis may provide information about possible infection, kidney problems, hydration and metabolic conditions.
In the NMC OSCE, the MSU station evaluates more than the candidate’s ability to collect a urine specimen. Candidates should also understand the purpose of urine analysis and the significance of common dipstick findings.
A strong candidate demonstrates an understanding of why the sample is required, communicates clearly with the patient and recognises that abnormal results may require further clinical assessment.
What should candidates understand?
Before attending the examination, candidates should revise:
- The purpose of collecting a midstream urine specimen.
- The importance of explaining the procedure to the patient.
- The significance of the eight parameters on an 8SG urine dipstick.
- The possible clinical meaning of abnormal urine findings.
- The importance of appropriate patient education.
- The need to recognise abnormal findings and communicate concerns to the appropriate healthcare professional.
Remember that the exact practical steps and marking requirements must be learned from the relevant OSCE station guidance. Understanding urine dipstick analysis complements practical preparation; it does not replace it.
2. Understanding the 8SG Urine Dipstick
An 8SG urine dipstick is used to assess eight parameters in a urine sample. Each parameter provides different information, and the findings should be interpreted in the context of the patient’s symptoms and clinical condition.
The eight parameters are:
- Protein
- Glucose
- Ketones
- Blood
- Nitrites
- Leukocytes
- Specific gravity
- pH level
Candidates should be able to identify each parameter and explain its general clinical significance.
The following sections provide a revision guide to each component, based on the information in the supplied MSU document.
3. Protein: Understanding Proteinuria
What is protein in urine?
Proteinuria refers to the presence of an abnormal amount of protein in urine. Normally, the kidneys filter waste products from the blood while retaining most proteins within the bloodstream.
When protein is detected in urine, it may indicate a problem affecting the kidneys.
Clinical significance
Persistent proteinuria may be associated with:
- Chronic kidney disease.
- Hypertension.
- Diabetic nephropathy.
A large amount of protein in urine may indicate a kidney problem and should not be ignored.
OSCE revision point: Proteinuria is associated with possible kidney damage, and persistent proteinuria may be linked to chronic kidney disease, hypertension or diabetic nephropathy.
4. Glucose: Recognising Glucosuria
What does glucose in urine mean?
Glucose is a type of sugar used by the body for energy. Normally, urine contains no detectable glucose on routine urine testing.
The presence of glucose in urine is called glucosuria.
According to the supplied document, glucosuria can indicate uncontrolled diabetes mellitus or renal glycosuria.
Clinical significance
Glucose in urine may be a useful clue when investigating possible diabetes or assessing a patient with known diabetes.
It can be associated with undiagnosed or poorly managed diabetes. However, urine glucose alone does not establish a diagnosis of diabetes.
Further assessment may be required to determine the reason for the finding.
OSCE revision point: Glucosuria means glucose is present in urine and may indicate uncontrolled diabetes mellitus or renal glycosuria.
5. Ketones: Understanding Ketonuria
What are ketones?
Ketones are substances produced when the body breaks down fat for energy rather than relying primarily on glucose.
The presence of ketones in urine is called ketonuria.
Ketones may appear in urine in several circumstances, including:
- Uncontrolled diabetes.
- Fasting.
- Starvation.
- Prolonged vomiting.
The finding must be interpreted in relation to the patient’s overall clinical condition.
Clinical significance
Ketonuria is particularly important in patients with diabetes. In the appropriate clinical context, ketones may indicate diabetic ketoacidosis, a serious complication requiring urgent medical assessment.
However, ketones can also occur because of fasting, starvation or prolonged vomiting. Therefore, candidates should not assume that every positive ketone result means the patient has diabetic ketoacidosis.
OSCE revision point: Ketonuria may be associated with uncontrolled diabetes, fasting, starvation or prolonged vomiting. In a diabetic patient, it may raise concern about diabetic ketoacidosis.
6. Blood: Understanding Haematuria
What is haematuria?
Haematuria means the presence of blood in urine.
A urine dipstick may detect blood even when the urine does not visibly appear bloody. A positive result can have several possible explanations and requires appropriate interpretation.
Clinical significance
The supplied document identifies the following possible causes of blood in urine:
- Urinary tract infection (UTI).
- Kidney stones.
- Trauma.
- Menstruation.
- Cancer.
The finding therefore needs further investigation rather than being attributed automatically to one specific condition.
OSCE revision point: Haematuria means blood in urine and requires further investigation.
7. Nitrites: Identifying a Possible Urinary Tract Infection
What are nitrites?
Certain bacteria can convert nitrates into nitrites in urine. A positive nitrite result can therefore provide useful evidence when assessing a possible bacterial urinary tract infection.
Clinical significance
A positive nitrite test strongly suggests a bacterial UTI, according to the supplied document.
Nitrites are often considered alongside leukocytes because both findings may support suspicion of urinary tract infection.
However, urine dipstick results should not be interpreted in isolation. Clinical symptoms and other relevant information remain important.
OSCE revision point: A positive nitrite result strongly suggests a bacterial UTI and is often assessed alongside leukocytes.
8. Leukocytes: Recognising White Blood Cells in Urine
What are leukocytes?
Leukocytes are white blood cells. They form part of the body’s immune system and help defend against infection.
The presence of leukocytes in urine may indicate inflammation or infection within the urinary tract.
Clinical significance
Leukocytes are commonly associated with UTIs. However, the supplied document also identifies contamination from vaginal secretions as a possible explanation for their presence.
This is one reason why correct specimen collection and appropriate interpretation are important.
OSCE revision point: Leukocytes indicate white blood cells in urine and may be associated with infection, inflammation or contamination.
9. Specific Gravity: Assessing Urine Concentration
What is specific gravity?
Specific gravity measures how concentrated urine is compared with water. It can provide useful information about hydration status and may contribute to the assessment of kidney function.
The supplied document gives the normal urine specific gravity range as 1.005 to 1.030.
Low specific gravity
Low specific gravity indicates relatively dilute urine and may be associated with overhydration.
High specific gravity
High specific gravity indicates more concentrated urine and may be associated with dehydration.
These associations should be interpreted carefully because specific gravity can also be influenced by other clinical factors.
Clinical significance
Specific gravity can be particularly useful when assessing fluid balance in patients who may be vulnerable to changes in hydration.
Examples include:
- Older adults.
- Post-operative patients.
- Critically ill patients.
In these situations, understanding urine concentration may contribute to a broader assessment of the patient’s fluid status.
OSCE revision point: The supplied document lists 1.005–1.030 as the normal range. Low specific gravity may be associated with overhydration, while high specific gravity may be associated with dehydration.
10. pH Level: Understanding Urine Acidity and Alkalinity
What does urine pH measure?
Urine pH measures how acidic or alkaline the urine is.
The supplied document gives the normal urine pH range as 4.6 to 8.0.
Urine pH can vary naturally. An abnormal or unexpected result may provide useful information when interpreted alongside the patient’s condition.
Acidic urine
The document identifies possible associations with acidic urine, including:
- Diabetic ketoacidosis.
- A high-protein diet.
- Diarrhoea.
These are possible associations rather than diagnoses that can be confirmed from pH alone.
Alkaline urine
The document identifies possible associations with alkaline urine, including:
- Urinary tract infection.
- Kidney failure.
- Prolonged vomiting.
The significance of the result depends on the patient’s clinical situation and any other relevant findings.
Why does pH matter?
Urine pH can affect the conditions in which certain kidney stones form and may influence the effectiveness of some medications.
For this reason, pH is a useful component of urine analysis.
OSCE revision point: The supplied document gives a urine pH range of 4.6–8.0. Both acidic and alkaline urine can have different clinical associations, so pH should not be used alone to diagnose a condition.
11. Quick Revision Table: The Eight Urine Dipstick Parameters
The following table summarises the main points candidates should revise before the NMC OSCE.
| Parameter | Meaning or significance |
| Protein | Proteinuria may indicate kidney damage; persistent proteinuria may be associated with chronic kidney disease, hypertension or diabetic nephropathy. |
| Glucose | Glucosuria may indicate uncontrolled diabetes mellitus or renal glycosuria. |
| Ketones | Ketonuria may occur with uncontrolled diabetes, fasting, starvation or prolonged vomiting. |
| Blood | Haematuria may be associated with UTI, kidney stones, trauma, menstruation or cancer; further investigation is needed. |
| Nitrites | A positive result strongly suggests a bacterial UTI. |
| Leukocytes | White blood cells in urine may indicate inflammation or infection; contamination is another possible explanation. |
| Specific gravity | Measures urine concentration; the supplied normal range is 1.005–1.030. |
| pH | Measures acidity or alkalinity; the supplied normal range is 4.6–8.0. |
Use this table for rapid revision, but make sure you understand the explanations behind each finding rather than memorising the table alone.
12. How to Prepare for the MSU Station in the NMC OSCE
Preparing for the MSU station requires both practical preparation and an understanding of the purpose of urine analysis.
Preparation and introduction
Perform hand hygiene using all seven steps according to WHO guidance. Greet the patient politely. Introduce yourself and explain your role. Explain the purpose of the procedure: “I am here to collect a midstream urine specimen and perform urine analysis as instructed by the doctor.” Obtain the patient’s consent. Explain the procedure and provide instructions on how to collect a midstream urine specimen. Ask whether the patient can collect the specimen independently or requires assistance. Provide the specimen container or verbalise that you are providing it. Ensure the patient is comfortable, address any concerns and provide the call buzzer. Perform hand hygiene before collecting the required equipment.
Collect and check the equipment
Ensure the tray is clean. Collect the urine analysis reagent strip bottle and check that it is dry, intact and within its expiry date. Collect a working fob watch with a second hand. Collect the documentation sheet and pen. Collect gauze, tissue paper or a kidney dish if required. Check that all equipment is ready for use. Perform hand hygiene. Put on an apron and gloves. Return to the patient, explain that you are ready to proceed and obtain permission to continue.
Explain how to collect a midstream urine specimen
Verbalise the following instructions to the patient: Wash your hands with soap and water. Separate the labia. Clean the urinary opening with soap and water, wiping from front to back. Begin passing urine into the toilet. Stop the flow briefly if possible. Position the specimen container a few centimetres away from the urethra without touching the skin. Collect the middle portion of the urine stream, filling approximately half the container. Pass the remaining urine into the toilet. Secure the specimen container and seek assistance if needed.
Prepare the urine analysis procedure
Position the tray and documentation sheet on a suitable surface. Keep the documentation sheet and pen accessible. Open the reagent strip bottle. Remove one reagent strip and close the bottle immediately. Open the urine specimen container carefully. Check the fob watch and prepare to time the procedure accurately. Dip the urine reagent strip Check the timing on the fob watch. Dip the reagent strip into the urine specimen for no longer than one second, following the technique described in the reference material. Ensure the reagent pads are dipped appropriately. Remove the strip immediately. Close the urine specimen container. Hold the strip in your non-dominant hand. Start timing immediately according to the station’s specified method. Compare each reagent pad with the manufacturer’s colour chart at the appropriate time. Document the results accurately and promptly.
Read and document the eight components
The reference document identifies eight components for the urine analysis station.
| Timing from dipping | Component to assess |
| 30 seconds | Glucose |
| 40 seconds | Ketones |
| 45 seconds | Specific gravity |
| 60 seconds | Blood, pH, protein and nitrite |
| 120 seconds | Leukocytes |
Documentation points
- Compare the colour of each reagent pad with the corresponding colour chart.
- Record the glucose result.
- Record the ketone result.
- Record the specific gravity as a numerical value.
- Record blood, pH, protein and nitrite results.
- Record the leukocyte result at the appropriate time.
- Use the correct symbols and categories indicated on the strip chart.
- For blood results, distinguish between haemolysed and non-haemolysed readings when the chart requires this.
- Check that all eight components have been documented.
- Complete the written results legibly and accurately.
Inform the patient of the results
- Explain the results in clear, patient-friendly language.
- Discuss any abnormal findings without making a diagnosis.
- Escalate abnormal or concerning results to the appropriate clinician according to the clinical situation and local policy.
Provide appropriate health education
Tailor the advice to the patient’s condition and the results obtained.
- Encourage adequate fluid intake if clinically appropriate.
- Advise the patient to maintain personal hygiene.
- Discuss appropriate physical activity according to the patient’s condition and mobility.
- If glucose or ketones are detected, report the findings for further clinical assessment rather than giving restrictive dietary advice without an appropriate clinical plan.
Complete the procedure and maintain safety
Inform the patient that you are finishing the procedure. Dispose of used items according to local infection prevention and waste-management policy. Remove gloves and apron safely. Perform hand hygiene. Recheck the documentation to ensure that all eight components are recorded. Ensure the patient is comfortable. Ask whether the patient has any concerns.
Ensure the call buzzer is within reach. Perform hand hygiene before leaving the patient. Report completion to the assessor and confirm that documentation and waste disposal have been completed.
Conclusion
The NMC OSCE MSU station assesses important aspects of urine specimen collection, urine analysis and patient-centred nursing care. Understanding the eight parameters on an 8SG urine dipstick helps candidates explain the purpose of testing and recognise the possible clinical significance of abnormal findings.
Protein may indicate a kidney problem, glucose may suggest diabetes-related concerns, ketones may reflect fat metabolism, and blood may require further investigation. Nitrites and leukocytes can contribute to the assessment of a possible urinary tract infection, while specific gravity provides information about urine concentration and pH measures acidity or alkalinity.
For first-time OSCE candidates, successful preparation involves more than memorising these findings. Candidates should practise the required procedure, learn the relevant marking criteria, communicate clearly and understand when abnormal findings may require further clinical assessment.
At Mentor Merlin, we aim to help candidates prepare systematically for their NMC OSCE by focusing on clinical understanding, practical skills, and verbalisation. Continue revising the MSU station, practise explaining the clinical significance of urine dipstick findings and use your relevant station guidance to strengthen your preparation.
Frequently Asked Questions About the NMC OSCE MSU Station
Q1. What does MSU stand for?
MSU stands for Midstream Specimen of Urine. It refers to a urine sample collected from the middle part of the urine stream for examination.
Q2. What does an 8SG urine dipstick test check?
It checks eight parameters: protein, glucose, ketones, blood, nitrites, leukocytes, specific gravity and pH.
Q3. What does protein in urine indicate?
Protein in urine may indicate kidney damage. Persistent proteinuria may be associated with chronic kidney disease, hypertension or diabetic nephropathy.
Q4. What does glucose in urine mean?
Glucose in urine, known as glucosuria, may indicate uncontrolled diabetes mellitus or renal glycosuria.
Worth A Try :
- Laboratory SuggestionA Semiautomated System for Routine Urinalysis Andre La Pointe, American Journal of Clinical Pathology, 1968
- Routine urinalysis in a general dermatology clinic D.J. Gawkrodger, British Journal of Dermatology, 1995
- Macroscopic Urinalysis as a Screening Procedure Arnold R. Tammes, American Journal of Clinical Pathology, 1979
- Letter to the EditorA Note on Routine Urinalysis Irwin Schoen, American Journal of Clinical Pathology, 1960
- Microscopic Urinalysis as a Screening Procedure Richard T. O’Kell, American Journal of Clinical Pathology, 1979
- Urinalysis Jane Lovegrove, Oxford Academic Books, 2012
- Urine and Urinalysis S. A. Levinson, American Journal of Clinical Pathology, 1949
- Microscopic Urinalysis Frederick W. Bauer, American Journal of Clinical Pathology, 1980
- A Quality Control Product for Urinalysis Stanley M. Becker, American Journal of Clinical Pathology, 1973
- Biochemical Screening in Urinalysis Frederick L. Kiechle, American Journal of Clinical Pathology, 1987
Read our recent blog – “Care Plan in APIE: Key Steps to Prepare for NMC OSCE” – to ensure your journey stays on track.
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