The "gold standard" for definitively identifying the specific microbe causing sepsis remains blood culture, but it's slow (days), leading to rapid clinical assessment using tools like SOFA/qSOFA scores and lactate levels, alongside biomarkers (like procalcitonin, CRP, PSP) for faster, early suspicion and monitoring, though new rapid molecular tests are emerging to bridge the gap.
Blood culture is the gold standard for diagnosis of blood stream infection but is limited by poor sensitivity and the required processing time.
Sepsis is diagnosed through a combination of rapid clinical assessment (fever, fast heart/breathing rate, confusion, low blood pressure) and tests like blood cultures, CBC, lactate, CRP, and urine/fluid analysis, often using tools like qSOFA, to find the infection source and check organ function, as there's no single test for it. Doctors look for signs of organ dysfunction alongside suspected infection, ordering imaging (X-rays, CT scans) to pinpoint the cause, with immediate antibiotic treatment crucial even before definitive results arrive.
Suspected infection plus. Two out of Four SIRS criteria. Temp > 100.9 (38.3) or < 96.8 (36) Heart Rate > 90. Respiratory rate > 20 or PaCO.
About sepsis
Symptoms of sepsis may include:
The Sepsis Six consists of three diagnostic and three therapeutic steps – all to be delivered within one hour of the initial diagnosis of sepsis: Titrate oxygen to a saturation target of 94% Take blood cultures and consider source control. Administer empiric intravenous antibiotics.
A consensus conference in 1991 defined “sepsis” as the combination of an infection with two or more features of what was called the “systemic inflammatory response syndrome” (SIRS): altered body temperature, elevated pulse rate, elevated respiratory rate and abnormal white blood cell count6.
Sepsis needs treatment in hospital straight away because it can get worse quickly. You should get antibiotics within 1 to 6 hours of arriving at hospital. If sepsis is not treated early, it can turn into septic shock and cause your organs to fail. This is life threatening.
The CBC of a patient with sepsis is commonly characterized by lymphocytopenia, neutrophilia, eosinopenia, thrombocytopenia, increased RDW, and increased NLR (Figure 2). The importance of thrombocytopenia in patients with sepsis is emphasized by the inclusion of platelet count in the SOFA score.
These infections are most often linked to sepsis:
Prothrombin time and partial thromboplastin time (PT and PTT), platelet count, and d-dimer: Sepsis can have serious effects on blood clotting inside your body. If the PT and PTT are too high, it can indicate your blood is not clotting well.
One of the best treatments up until now has been a combination of meropenem, tigecycline and colistin. A second option might be the combination therapy with tigecycline, gentamicin and meropenem. In moderately ill patients, it is recommended to administer the combination of tigecycline and gentamicin.
Because sepsis can happen quickly, it is important to be alert for early signs. The most common signs include the following: Source of infection (cough, sore throat, abdominal pain, pain with urination) and fevers. High heart rate.
There is no definitive diagnostic test for sepsis. Along with clinical data, laboratory testing can provide clues that indicate the presence of or risk of developing sepsis. Serum lactate measurement may help to determine the severity of sepsis and is used to monitor therapeutic response.
The REDS score is a new, simple and objective scoring system that uses widely available variables to risk-stratify ED patients suspected of having sepsis and is better than its component scores.
Infections that lead to sepsis most often start in the:
Early warning signs of sepsis include fever or low temperature, chills, rapid breathing or heart rate, confusion, slurred speech, extreme pain or discomfort, clammy/sweaty skin, and reduced urine output, with children potentially showing fewer wet nappies, vomiting, or a non-fading rash. These symptoms, often appearing after an infection, signal a severe body response and require immediate emergency care, as sepsis can rapidly worsen, according to the Mayo Clinic.
There are no doctors who specialize in treating sepsis. The doctors who are most likely to see patients who have sepsis are intensivists (physicians who work in the intensive care unit) and emergency room physicians, who see the patients when they come in for urgent care.
However, over the past 25 y it has been shown that gram-positive bacteria are the most common cause of sepsis. Some of the most frequently isolated bacteria in sepsis are Staphylococcus aureus (S. aureus), Streptococcus pyogenes (S. pyogenes), Klebsiella spp., Escherichia coli (E.
The hi-tech blood test shows whether an infection is viral or bacterial quicker than traditional tests – so serious diseases like sepsis or meningitis can be picked up sooner. If the trial is successful, it could make a vital difference to the care children receive.
Based on the results of this study, presepsin is a superior marker for diagnosis of sepsis as compared to PCT. This study showed the sensitivity of presepsin more than PCT. Even the AUC for presepsin was more than that of both PCT and CRP, which makes the diagnostic accuracy of presepsin the best among PCT and CRP.
What is Red Flag sepsis? Red Flag Sepsis was developed by the UK Sepsis Trust in 2015. It is a practical, operational tool that empowers frontline health professionals to act without the need to apply the complex formal international definition of sepsis.
Diagnosing sepsis
Blood and urine tests and imaging scans may be used to help identify the type and location of infection. People at risk of sepsis or who previously have had sepsis should be proactive in talking with their healthcare team about the possibility of sepsis when they are feeling ill.
1st Line: Ciprofloxacin 500mg oral 12 hourly. (If nil by mouth, use Co-amoxiclav IV First Line). 2nd Line: Co-amoxiclav 625mg oral 8 hourly. If IV required: Co-amoxiclav 1.2g IV 8 hourly.