Beyond SpO₂: Evidence-Based Oxygen Therapy in Renal and Urology Care

However, evidence tells a more nuanced story.

National guidance is clear that oxygen is a prescribed treatment with specific target saturation ranges, not a blanket therapy for all unwell patients (O’Driscoll et al., 2017; NICE, 2017). Excessive oxygen administration can lead to hyperoxia, which has been associated with increased oxidative stress, vasoconstriction, and, in some acutely ill populations, increased mortality (Chu et al., 2018; Girardis et al., 2016). In other words, more oxygen is not always better.

In renal and urology practice, this is particularly important. Many of our patients have fluid overload, sepsis secondary to urinary tract infections, anaemia of chronic kidney disease, or post-operative complications. Hypoxia in these patients is often a symptom of an underlying physiological disturbance — such as pulmonary oedema or metabolic imbalance — rather than a primary respiratory condition. Simply increasing oxygen flow rates without addressing the root cause risks masking deterioration instead of managing it.

I have learned, sometimes through difficult shifts, that oxygen should prompt deeper clinical thinking rather than automatic escalation. A falling SpO₂ reading is not just a number; it is a cue to assess respiratory effort, fluid balance, infection markers, haemoglobin levels, and overall clinical trajectory. Pulse oximetry itself has limitations and does not reflect ventilation, carbon dioxide retention, or tissue oxygen delivery (Jubran, 2015). Particularly in renal patients with chronic anaemia, a “normal” saturation may not equate to adequate oxygen delivery at the cellular level (Macdougall et al., 2016).

💡Clinical Insight

Oxygen therapy in renal and urology patients must be individualised. Fluid overload, anaemia, metabolic acidosis and infection all alter oxygen delivery at a tissue level — meaning a “normal” SpO₂ does not always equal adequate perfusion or stability. Clinical reasoning must extend beyond the monitor.

Clinical Context in Renal and Urology Practice

In renal and urology settings, patients often present with complex and interrelated physiological challenges. Many are living with acute kidney injury, chronic kidney disease, sepsis secondary to urinary tract infections, post-operative complications following urological surgery, or significant fluid imbalance. These conditions can directly and indirectly affect respiratory function and oxygenation. Fluid overload, metabolic acidosis, anaemia, and systemic infection are all common in this patient group and may contribute to breathlessness and hypoxia (Macdougall et al., 2016; Hoste et al., 2018).

In my experience, it is rarely helpful to view low oxygen saturations in isolation. More often, they are part of a wider picture of deterioration. For example, patients with declining renal function are at increased risk of pulmonary oedema due to impaired fluid excretion, which can significantly compromise gas exchange (Ronco et al., 2019). Similarly, urosepsis can lead to acute respiratory distress through systemic inflammation and capillary leak (Singer et al., 2016).

One case that remains vivid in my practice involved a post-nephrectomy patient who became increasingly breathless overnight. His SpO₂ dropped to 91%, and oxygen was promptly commenced at 15 L/min via a non-rebreather mask. Initially, this appeared to be effective, as his saturations improved. However, within hours, his respiratory distress worsened and he developed signs of pulmonary oedema. A multidisciplinary review revealed a significantly positive fluid balance and deteriorating renal function. The primary issue was not respiratory failure, but fluid overload secondary to reduced kidney function.

This experience highlighted how easily oxygen can mask underlying pathology. Research supports that while supplemental oxygen may temporarily improve oxygen saturation, it does not address impaired ventilation-perfusion matching or fluid-related alveolar flooding (O’Driscoll et al., 2017). Without timely identification of the underlying cause, deterioration may be delayed rather than prevented.

For nurses working in renal and urology environments, this reinforces the importance of holistic assessment. Oxygen saturations should always be interpreted alongside fluid balance charts, daily weights, urine output, renal blood results, infection markers, and full respiratory assessment. Respiratory rate, work of breathing, and mental status are often more sensitive indicators of clinical decline than SpO₂ alone (Cretikos et al., 2008). Over time, I have learned that effective oxygen management in this setting requires both clinical vigilance and professional confidence. It involves questioning why a patient is hypoxic, not just how quickly their saturations can be corrected. By integrating evidence-based knowledge with bedside assessment, nurses can play a crucial role in identifying deterioration early and advocating for timely medical intervention.

💡Clinical Insight

Oxygen therapy is not medicine by default — it is an intervention with physiological effects that must be matched to specific clinical need, not just numbers.

Assessment and Escalation: Looking Beyond the Monitor

In renal and urology nursing, effective oxygen management begins with a thorough, systematic assessment. A falling SpO₂ reading should never be viewed in isolation. Instead, it should act as a trigger for wider clinical review, prompting nurses to ask not only what is happening, but why.

National guidance from the National Institute for Health and Care Excellence emphasises that early recognition of deterioration relies on combining physiological observations with clinical judgement, rather than relying solely on scoring systems (NICE, 2017). While tools such as NEWS2 are valuable, they are most effective when supported by a comprehensive bedside assessment.

In my practice, I have found that the most effective starting point is often a return to fundamental principles. A structured approach, such as ABCDE, helps ensure that subtle signs are not missed. This includes assessing:

• Airway patency
• Breathing pattern, respiratory rate, and work of breathing
• Circulation, including blood pressure, heart rate, and fluid balance
• Disability, including confusion and reduced consciousness
• Exposure, including signs of infection or fluid overload

Evidence suggests that respiratory rate remains one of the most sensitive indicators of deterioration; yet, it is still frequently underrecognized (Cretikos et al., 2008). In renal patients, increasing respiratory effort may indicate pulmonary oedema, metabolic acidosis, or worsening sepsis, even before saturations fall significantly.

Alongside physical assessment, reviewing clinical data is essential. In renal and urology settings, this includes urine output trends, daily weights, creatinine levels, inflammatory markers, and fluid balance charts. Studies highlight that cumulative positive fluid balance is strongly associated with poorer outcomes in critically ill and renal patients (Hoste et al., 2018; Ronco et al., 2019). Over time, I have learned that deteriorating oxygenation often reflects systemic decline rather than isolated respiratory pathology. Escalation, therefore, must be timely and evidence-informed.

💡Clinical Insight

Ventilatory effort and respiratory pattern often change long before SpO₂ drops — watch for rising respiratory rate, accessory muscle use, and increased work of breathing.

Knowing When and How to Escalate

Escalation is not a sign of failure; it is a fundamental component of safe nursing practice. Guidance from the British Thoracic Society stresses that increasing oxygen requirements should prompt urgent clinical review, rather than repeated flow-rate escalation (O’Driscoll et al., 2017).

In practical terms, escalation should occur when:

• Oxygen requirements are increasing
• Target saturations cannot be maintained
• Respiratory distress is worsening
• Mental status is deteriorating
• Urine output is falling
• NEWS2 scores are rising

In renal wards, I have often found that rising oxygen needs are an early warning sign of fluid overload or evolving sepsis. Prompt escalation allows timely interventions such as diuretic review, dialysis planning, antimicrobial optimisation, or senior medical assessment.

Using structured communication tools such as SBAR supports clear and confident escalation. Evidence suggests that structured handovers improve clinical decision-making and reduce delays in treatment (Müller et al., 2018). When escalating concerns, I aim to clearly link oxygen changes with wider physiological trends, rather than reporting saturations alone.

💡Clinical Insight

An increasing oxygen requirement is a clinical red flag. Escalation should focus on identifying and treating the underlying cause — not simply increasing flow rates to maintain target saturations.

Professional Responsibility and Advocacy

Professional responsibility and patient advocacy sit at the heart of nursing practice. The Royal College of Nursing emphasises that nurses have a duty to recognise early signs of deterioration, raise concerns promptly, and act in the best interests of patients (RCN, 2019). This responsibility extends beyond following protocols; it requires critical thinking, moral courage, and a willingness to speak up, even in challenging circumstances.

Fulfilling this role is not always straightforward. Busy ward environments, staffing pressures, high patient acuity, and competing clinical priorities can make escalation feel difficult or delayed. Research suggests that organisational culture and workload are significant factors influencing whether nurses feel confident to raise concerns (Francis, 2013; Massey et al., 2017). In renal and urology settings, where patients may appear stable before deteriorating rapidly, these barriers can have serious consequences.

Early in my career, I sometimes hesitated to escalate until observations reached clearly “critical” thresholds. I worried about overreacting, interrupting senior staff, or being perceived as inexperienced. Looking back, I now recognise that this hesitation was rooted in uncertainty rather than sound clinical judgement. Evidence indicates that deterioration is often preceded by subtle changes that may be missed if escalation relies solely on numerical triggers (Cretikos et al., 2008).

With experience, reflection, and continued learning, my approach has changed. I have learned to value clinical intuition alongside objective data. When something “does not feel right” — such as a patient becoming more fatigued, withdrawn, or increasingly dependent on oxygen — I am now more confident in voicing my concerns, even if observations remain only mildly abnormal. Studies support that experienced nurses often detect deterioration through pattern recognition and intuitive judgement before formal criteria are met (Benner et al., 2009).

One of the most important lessons I have learned is that timely escalation protects both patients and practitioners. Early communication allows senior clinicians to intervene before a crisis develops and supports shared decision-making. Clear, objective documentation and structured communication further strengthen this process and reduce the risk of misunderstanding (Müller et al., 2018).

💡Clinical Insight

Professional responsibility in oxygen therapy extends beyond task completion. Nurses are accountable not only for administering oxygen safely, but for questioning inappropriate targets, recognising unsafe practice, and advocating for timely review when a patient’s condition changes. Advocacy is a clinical skill — and speaking up can prevent harm.

Integrating Assessment, Oxygen, and Escalation

Effective oxygen management in renal and urology practice sits at the intersection of assessment, interpretation, and communication. Oxygen should never be used to compensate for delayed escalation or incomplete assessment. Instead, it should function as a supportive measure while underlying causes such as fluid overload, infection, anaemia, or metabolic imbalance are identified and treated. Evidence demonstrates that integrated monitoring systems and early response protocols reduce adverse events, unplanned ICU admissions, and in-hospital mortality (Massey et al., 2017; NICE, 2017). Nurses are central to making these systems effective in everyday practice through vigilant observation and timely communication.

In my experience, the most effective care occurs when oxygen therapy is viewed as part of a wider clinical strategy rather than a standalone intervention. Reviewing trends in observations, fluid balance, and blood results alongside oxygen requirements allows nurses to anticipate deterioration and support early intervention. Research suggests that recognising patterns over time is key to preventing avoidable harm in hospitalised patients (Cretikos et al., 2008; Benner et al., 2009).

This integrated approach also strengthens multidisciplinary working. When nurses present clear, evidence-informed assessments, escalation conversations become more focused and productive. Rather than simply reporting falling saturations, linking oxygen changes to wider physiological trends supports timely decision-making and collaborative care planning (Müller et al., 2018). In renal and urology settings, where patients are often managed by multiple specialist teams, this clarity is particularly valuable.

Through reflection and clinical experience, I have come to see assessment and escalation as inseparable from oxygen therapy. When saturations fall, our responsibility extends far beyond adjusting flow rates. It requires us to interpret complex physiology, recognise subtle warning signs, review trends, and confidently advocate for patients when concerns arise. In any hospital setting where deterioration is often rapid and multifactorial, this holistic, evidence-based approach is not optional. It is fundamental to delivering safe, compassionate, and professionally accountable care, and to ensuring that oxygen therapy supports recovery rather than masking clinical decline.

💡Clinical Insight

Escalation should focus on clinical trajectory, not just the absolute SpO₂ value — rising oxygen requirements or deteriorating respiratory effort deserve urgent review even if numbers are within “targets.”

Documentation and Monitoring: Making Care Visible and Safe

In renal and urology nursing, documentation is far more than an administrative task. It is a clinical tool that supports patient safety, continuity of care, and professional accountability. In the context of oxygen therapy, clear and accurate records are essential for ensuring that treatment remains appropriate, responsive, and evidence-based.

Guidance from the NICE emphasises that high-quality record keeping is fundamental to recognising deterioration and coordinating timely intervention (NICE, 2017). Yet in busy clinical environments, documentation is often completed under pressure, increasing the risk of omissions or vague entries.

Early in my career, I underestimated the long-term impact of small gaps in documentation. Over time, I have seen how unclear records can delay escalation, create confusion during handovers, and compromise patient safety — particularly in complex renal cases where patients’ conditions can change rapidly.

Recording Oxygen Therapy Effectively

Evidence-based guidance from the British Thoracic Society states that oxygen should be prescribed, monitored, and documented in the same way as any other medication (O’Driscoll et al., 2017). This includes recording not only that oxygen is in use, but how and why it is being administered.

Good documentation should clearly include:

• Oxygen delivery device
• Flow rate or FiO₂
• Target saturation range
• Current SpO₂ readings
• Patient response
• Any adjustments made
• Escalation actions taken

In renal settings, it is also important to document relevant contributing factors such as fluid balance, dialysis schedules, and changes in renal function. These details help create a complete clinical picture and support safe decision-making.I have learned that writing “on 2 L nasal cannulae” is rarely enough. Without context, it tells the next clinician very little about whether the patient is improving, deteriorating, or simply being maintained without review.

Monitoring Trends, Not Just Numbers

Effective monitoring involves recognising patterns over time rather than focusing on isolated observations. Research suggests that deterioration is often preceded by subtle physiological changes that may be missed if observations are viewed individually (Massey et al., 2017).

In practice, this means paying close attention to trends such as:

• Gradually increasing oxygen requirements
• Rising respiratory rate
• Declining urine output
• Worsening fluid balance
• Increasing confusion or fatigue

In renal patients, these changes may reflect fluid overload, evolving sepsis, or metabolic imbalance. Monitoring these patterns allows nurses to anticipate deterioration rather than react to crisis. Personally, I have found that reviewing observation charts and fluid balances at the start of every shift helps me identify early warning signs that might otherwise be overlooked. This habit has often prompted timely conversations with medical teams and prevented avoidable escalation.

💡Clinical Insight

Oxygen therapy must be documented as a prescribed intervention with indication, device, target saturation, and response — not just as “observed SpO₂ challenged.”

Professional Accountability and Legal Protection

High-quality documentation also protects nurses professionally. The Royal College of Nursing highlights that nursing records serve as legal evidence of care provided and professional judgement exercised (RCN, 2019). In this context, documentation is not simply a record of tasks completed, but a reflection of clinical reasoning, decision-making, and professional responsibility.

In situations where a patient deteriorates, documentation becomes the primary record of:

• Assessment findings
• Clinical concerns
• Escalation attempts
• Responses from senior staff
• Actions taken

These records may later be reviewed during incident investigations, complaints, safeguarding processes, or legal proceedings. Accurate and contemporaneous notes provide a clear account of events and demonstrate that appropriate steps were taken in response to changing clinical circumstances. From experience, I have learned that clear, objective, and timely documentation is one of the strongest forms of professional advocacy — both for patients and for ourselves. When concerns are recorded factually and consistently, they support continuity of care and reinforce the nurse’s role in recognising and responding to deterioration.

Equally important is the tone and content of professional records. Guidance recommends that documentation should be factual, unbiased, and free from emotive or speculative language (RCN, 2019). Writing what is observed, what is done, and who is informed helps ensure that records remain credible and defensible. In high-acuity renal and urology settings, where patients may decline rapidly, this clarity provides reassurance that care has been delivered responsibly and in line with professional standards. Ultimately, strong documentation safeguards professional integrity. It enables nurses to demonstrate accountability, uphold ethical practice, and advocate confidently for patients within complex clinical systems. In doing so, it reinforces trust in both individual practitioners and the wider nursing profession.

Supporting Continuity of Care

In renal and urology wards, patients are often managed by multidisciplinary teams, including nephrologists, surgeons, dialysis staff, pharmacists, and specialist nurses. Accurate documentation ensures that oxygen management decisions are visible across disciplines and remain consistent across shifts. Guidance from the Royal College of Nursing emphasises that clear records are essential for safe handover and coordinated care, particularly in complex clinical environments (RCN, 2019).

During handovers, well-documented oxygen therapy enables incoming staff to understand:

• Why oxygen was started
• Whether target saturations are being met
• What interventions have already been tried
• When medical review is due
• Without this clarity, care can become fragmented and reactive, increasing the risk of delayed intervention or unnecessary escalation.

In my experience, continuity of care is strongest when documentation provides a clear clinical narrative rather than isolated observations. Linking oxygen requirements to fluid balance, infection markers, and recent clinical decisions helps the wider team understand the patient’s trajectory. Research suggests that structured and comprehensive handover communication improves patient safety and reduces adverse events (Müller et al., 2018).

💡Clinical Insight

Effective oxygen therapy integrates evidence, trend interpretation and clinical judgment — it is not a “set and forget” therapy.

Reflection on Practice

Working in renal and urology settings has taught me that oxygen therapy is never just about correcting numbers on a monitor. Behind every falling saturation is a complex clinical story shaped by fluid balance, infection, anaemia, and overall physiological reserve. Evidence clearly shows that oxygen must be prescribed, monitored, and reviewed carefully, rather than applied automatically (O’Driscoll et al., 2017; Chu et al., 2018). Through experience, I have learned that meaningful oxygen management depends on holistic assessment, early escalation, and clear communication — not simply increasing flow rates.

More importantly, this journey has strengthened my confidence as a nurse. Trusting both evidence and professional judgement, documenting clearly, and advocating early have become central to my practice. In fast-paced renal environments, where patients can deteriorate quickly, moving beyond SpO₂ numbers allows us to deliver safer, more compassionate, and more accountable care. Ultimately, oxygen therapy is most effective when it supports critical thinking, protects patient dignity, and reflects the professionalism at the heart of nursing practice.

💡Clinical Insight

Oxygen therapy should never be viewed in isolation. Assessment findings, oxygen delivery, and escalation decisions are interconnected — and safe practice depends on recognising patterns, not reacting to single values. Integrating clinical judgment with objective data ensures that deterioration is addressed early, rather than temporarily masked.

Key Resources:

• Benner, P.E., Chesla, C.A. and Tanner, C.A.(2009) Expertise in nursing practice: caring, clinical judgment & ethics. 2nd edn. New York: Springer Publishing.
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• Cretikos, M.A., Bellomo, R., Hillman, K., Chen, J., Finfer, S. and Flabouris, A.(2008) ‘Respiratory rate: the neglected vital sign’, Medical Journal of Australia, 188(11), pp. 657–659.
• Francis, R.(2013) Report of the Mid Staffordshire NHS Foundation Trust Public Inquiry. London: The Stationery Office (HC 947).
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• Hoste, E.A., Maitland, K., Brudney, C.S., Bouchard, J., Canet, J., Etchepareborda, S., Morales-Quinteros, L., Magder, S., Pinsky, M.R., Thiele, R.H., de Backer, D. and Malbrain, M.L.(2018) ‘Four phases of intravenous fluid therapy: a conceptual model’, British Journal of Anaesthesia, 113(5), pp. 740–747.
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• Massey, D., Chaboyer, W. and Anderson, V.(2017) ‘Recognising and responding to patient deterioration’, Nursing Standard, 31(27), pp. 54–63.
• Müller, M., Jürgens, J., Redaèlli, M., Klingberg, K., Stock, S. and Müller, D.(2018) ‘Impact of the communication and patient hand-off tool SBAR on patient safety: a systematic review’, BMJ Open, 8(8), p. e022202.
• National Institute for Health and Care Excellence (NICE)(2007) Acutely ill adults in hospital: recognising and responding to deterioration (CG50). London: NICE.
• O'Driscoll, B.R., Howard, L.S., Earis, J. and Mak, V.(2017) ‘BTS guideline for oxygen use in adults in healthcare and emergency settings’, Thorax, 72(Suppl 1), pp. ii1–ii90.
• Ronco, C., Bellomo, R. and Kellum, J.A.(2019) ‘Acute kidney injury’, The Lancet, 394(10212), pp. 1949–1964.
• Royal College of Nursing (RCN)(2019) Record keeping: guidance for nurses and midwives. London: RCN.
• Singer, M., Deutschman, C.S., Seymour, C.W., Shankar-Hari, M., Annane, D., Bauer, M., Bellomo, R., Bernard, G.R., Chiche, J.D., Coopersmith, C.M., Hotchkiss, R.S., Levy, M.M., Marshall, J.C., Martin, G.S., Opal, S.M., Rubenfeld, G.D., van der Poll, T., Vincent, J.L. and Angus, D.C.(2016) ‘The Third International Consensus Definitions for Sepsis and Septic Shock (Sepsis-3)’, JAMA, 315(8), pp. 801–810.