7 Interpreting Findings and Responding to Complications

Interpret findings in context

Interpret a result alongside the patient’s symptoms, baseline, trends, medications, procedure, and the reporting laboratory’s reference range. A result outside the reference range is not automatically disease, and a result within range does not rule out a problem. Positive, negative, and inconclusive results describe what a test detected; they are not necessarily the final diagnosis.

A single reassuring result or a phrase such as “no acute abnormality” does not outweigh worsening symptoms. Correlate imaging and other test findings with the patient, and promptly escalate unexpected findings identified as urgent.

Assess, escalate, and reassess

When a result or new symptom may indicate immediate danger, use a sequence that puts the patient’s condition first:

1. Assess the patient. Check airway, breathing, circulation, mental status, vital signs, and the procedure or puncture site.

2. Act on immediate threats. Stay with the patient, summon appropriate emergency or rapid-response help, and follow local protocols. Do not delay escalation to repeat a clearly critical result.

3. Verify and communicate. Check patient and specimen identifiers, units, the reference range, timing, and relevant trends. Promptly report critical or unexpected results using a clear handoff, and document actions and responses.

4. Reassess. Continue monitoring and report deterioration, even if an initial test appears reassuring.

Interpret laboratory findings

Use laboratory ranges and the clinical picture when interpreting blood tests. A falling hemoglobin or hematocrit may indicate blood loss, especially when accompanied by tachycardia, hypotension, pallor, dizziness, or visible bleeding. Interpret white-cell and platelet results using the laboratory’s range and the patient’s clinical picture.

Markedly abnormal potassium can affect cardiac rhythm, and symptoms may be absent. New weakness, palpitations, or ECG changes increase concern.

Typical adult arterial blood gas (ABG) reference ranges include:

• pH: $7.35\text{–}7.45$

• PaCO₂: $35\text{–}45\ \mathrm{mmHg}$

• HCO₃⁻: $22\text{–}26\ \mathrm{mEq/L}$

PaO₂ and oxygen saturation also help assess oxygenation. Interpret ABG values together and in context, including the patient’s oxygen support.

Respond to dangerous potassium findings

A potassium result of $6.8\ \mathrm{mEq/L}$, palpitations, and peaked T waves on the ECG are an urgent, potentially life-threatening finding. Assess the patient, promptly summon the responsible clinician or emergency response team, maintain cardiac monitoring, and follow the facility’s hyperkalemia protocol. Communicate the result and ECG changes immediately; do not wait for symptoms to worsen.

If the result is unexpected, the clinician may consider specimen problems such as hemolysis, but verification must not delay urgent assessment and escalation. Abnormal potassium can cause arrhythmias, and a compatible ECG change makes the finding especially concerning.

Recognize respiratory compromise after sedation

After a sedated procedure, difficulty arousing the patient, slow breathing, and falling oxygen saturation require an immediate response. Assess responsiveness and airway, breathing, and circulation; call for help; and begin emergency measures under local protocol. Support the airway and ventilation as indicated, provide oxygen according to protocol, and continue close monitoring. Report the change and the sedating medications given.

Reduced alertness with slow breathing and declining oxygenation may indicate sedation-related respiratory compromise. Interpret a monitor reading alongside the patient’s breathing and level of consciousness.

Respond to possible post-procedure bleeding

New dizziness after a needle biopsy, a puncture dressing becoming saturated, and a rising pulse call for assessment and prompt escalation. Check vital signs and the site, apply direct pressure if appropriate for the procedure, summon clinical help, and report the bleeding and pulse change. Continue reassessment and follow the procedure-specific escalation protocol.

Do not remove a blood-soaked dressing just to inspect underneath. If needed, add a dressing over it while seeking help. Ongoing bleeding with signs of possible circulatory change is more concerning than local soreness or a small, stable bruise.

Respond to a contrast reaction

If widespread hives, throat tightness, and wheezing develop during contrast-enhanced imaging, stop contrast administration if it is still running. Call the emergency response team, assess and support airway, breathing, and circulation, and follow the facility’s contrast-reaction protocol. Stay with the patient and monitor closely.

Widespread hives with throat or respiratory symptoms can signal a severe acute reaction and requires an immediate response rather than routine observation.

Respond to an abnormal result without symptoms

A slightly out-of-range result does not automatically mean an emergency when the patient feels well and the result is similar to prior results. Check the report’s reference range, units, prior results, patient-specific context, and symptoms; then follow the ordered plan and facility policy for reporting or follow-up.

Escalate promptly if the result is designated critical, is substantially changed, or occurs with concerning symptoms. Reference ranges vary, and an out-of-range result alone does not establish a diagnosis; trends and the patient’s condition matter.