Research shows that a simple blood test called PNI (Prognostic Nutritional Index) can predict which elderly patients are at higher risk of death within one year after hip fracture surgery. In a 2026 study of 257 hip fracture patients in intensive care, those with lower PNI scores had significantly higher mortality risk, with each point decrease in PNI associated with a 7.2% increase in death risk. While another similar test called HALP also showed differences between survivors and non-survivors, only PNI remained an independent predictor when other factors were considered. These simple blood tests measuring nutrition and immune health could help doctors identify vulnerable patients early and provide better care.
When elderly patients break their hip and need surgery, doctors want to know who might have trouble recovering. Researchers looked at two simple blood tests that measure nutrition and immune health in 257 older adults admitted to intensive care after hip fracture surgery. According to Gram Research analysis, one test called PNI (Prognostic Nutritional Index) was better at predicting which patients might not survive the first year after surgery. The study found that patients with lower PNI scores were at higher risk, suggesting these quick, inexpensive blood tests could help doctors identify vulnerable patients early and provide better care.
Key Statistics
A 2026 study of 257 elderly hip fracture patients in intensive care found that those who did not survive had significantly lower PNI scores (34.1 versus 37.9 in survivors, p=0.004), suggesting nutritional status predicts one-year mortality.
Research published in BMC Geriatrics showed that each point decrease in preoperative PNI was associated with a 7.2% increase in mortality risk in elderly hip fracture patients, with a hazard ratio of 0.928 (95% CI 0.874-0.987).
Among 257 hip fracture patients admitted to intensive care, non-survivors had significantly lower HALP scores (median 11.3 versus 17.3 in survivors, p=0.003), though HALP did not independently predict outcomes in multivariable analysis.
A 2026 analysis of 257 elderly hip fracture patients found that male gender, presence of cancer, and multiple existing medical conditions were independent predictors of one-year mortality alongside nutritional status.
The Quick Take
- What they studied: Whether two simple blood tests measuring nutrition and immune function could predict which elderly hip fracture patients would survive their first year after surgery.
- Who participated: 257 elderly patients aged 65 and older who were admitted to intensive care after hip fracture surgery. Of these, 40 patients died within one year and 217 survived.
- Key finding: The PNI blood test was an independent predictor of one-year survival. Patients with lower PNI scores had significantly higher risk of death. The HALP score, while showing differences between survivors and non-survivors, did not independently predict outcomes in the final analysis.
- What it means for you: If you or a loved one faces hip fracture surgery, doctors may use a simple blood test to assess nutritional status and predict recovery risk. This could help guide more intensive monitoring and care for high-risk patients. However, these tests are just one tool and should not replace comprehensive medical evaluation.
The Research Details
Researchers conducted a retrospective study, meaning they looked back at medical records of 257 elderly patients who had already undergone hip fracture surgery and intensive care treatment. They collected information about each patient’s age, medical history, and blood test results taken before surgery. They then compared blood test results between patients who survived one year and those who did not.
The study examined two specific blood tests: HALP score (which combines measurements of hemoglobin, albumin, lymphocytes, and platelets) and PNI (Prognostic Nutritional Index, which combines albumin and lymphocyte counts). Both tests reflect how well a person’s body is nourished and how strong their immune system is. The researchers used statistical methods to determine which factors independently predicted whether patients would survive their first year after surgery.
Hip fractures in elderly patients are serious injuries with high complication rates. Doctors need reliable ways to quickly identify which patients are at highest risk so they can provide extra support and monitoring. These blood tests are simple, inexpensive, and can be done immediately before surgery, making them practical tools for real-world hospital settings. Understanding which nutritional markers best predict outcomes helps doctors make better decisions about patient care.
This study has several strengths: it included a reasonable sample size of 257 patients, used established statistical methods, and examined real patient data. However, it was a single-center retrospective study, meaning results come from one hospital and rely on existing records rather than a controlled experiment. The study was published in 2026 in BMC Geriatrics, a peer-reviewed medical journal. The blood test scores showed only modest ability to distinguish between survivors and non-survivors (AUC values around 0.64), suggesting these tests work better as part of a complete assessment rather than alone.
What the Results Show
Patients who did not survive had significantly lower PNI scores (34.1 compared to 37.9 in survivors) and lower HALP scores (11.3 compared to 17.3 in survivors). When researchers used statistical modeling to account for other factors like age, gender, and existing medical conditions, PNI remained an independent predictor of one-year mortality. Specifically, each point decrease in PNI was associated with a 7.2% increase in mortality risk.
Interestingly, HALP score did not remain an independent predictor once other factors were considered, even though survivors and non-survivors had different HALP scores initially. This suggests that while HALP reflects nutritional status, it may not add unique predictive information beyond what other clinical factors already tell us.
Other factors that independently predicted mortality included being male, having cancer, and having multiple existing medical conditions. These findings suggest that nutritional status, measured by PNI, is an important but not sole determinant of survival after hip fracture surgery in elderly patients.
The study found that male gender, presence of malignancy (cancer), and higher Charlson Comorbidity Index (a measure of existing health problems) were all independent predictors of mortality. This means these factors remained important even after accounting for nutritional status. The combination of poor nutrition plus multiple existing health conditions appears to create the highest risk for poor outcomes.
Previous research has suggested that nutritional status affects surgical outcomes, but this study provides specific evidence for hip fracture patients in intensive care. The finding that PNI outperforms HALP in this population is somewhat surprising, as both tests measure similar aspects of nutrition and immunity. This suggests that the specific combination of albumin and lymphocytes (which make up PNI) may be more relevant to hip fracture recovery than the broader combination used in HALP. The modest predictive power of both tests (AUC around 0.64) indicates they work best alongside other clinical assessments rather than as standalone predictors.
This study looked backward at existing medical records rather than following patients forward prospectively, which can introduce bias. The study included only patients who were sick enough to require intensive care after hip fracture surgery, so results may not apply to less severely ill patients. The study was conducted at a single hospital, so results may differ in other settings. The blood tests showed only modest ability to predict outcomes, meaning they cannot reliably identify high-risk patients on their own. The study did not examine whether improving nutritional status before surgery might improve outcomes. Finally, the study did not account for all possible factors that might affect survival, such as physical therapy quality or family support.
The Bottom Line
For patients facing hip fracture surgery: Ask your doctor to check your nutritional status before surgery. If your PNI score is low, discuss with your medical team what steps might improve your nutrition before and after surgery, such as protein-rich foods or nutritional supplements. For healthcare providers: Consider using PNI as one tool among many to identify high-risk elderly hip fracture patients who may benefit from enhanced monitoring and nutritional support. Do not rely on PNI alone to make clinical decisions. Confidence level: Moderate. While this study shows PNI predicts outcomes, the modest predictive power means it should complement, not replace, comprehensive clinical assessment.
This research is most relevant to elderly patients (65 and older) facing hip fracture surgery, their families, and healthcare providers in intensive care settings. It may be less relevant to younger patients with hip fractures or those not requiring intensive care. Patients with multiple existing medical conditions or cancer should pay particular attention to nutritional status before surgery.
Blood tests can be done immediately before surgery, providing quick information for care planning. Nutritional improvements may take weeks to months to show measurable changes. Survival outcomes were measured at one year in this study, so that is the relevant timeframe for assessing impact.
Frequently Asked Questions
What is the PNI score and how does it predict survival after hip fracture surgery?
PNI (Prognostic Nutritional Index) combines measurements of albumin and lymphocytes from a simple blood test. Research shows lower PNI scores predict higher mortality risk in elderly hip fracture patients. Each point decrease in PNI increases death risk by about 7%, making it a useful tool for identifying vulnerable patients who need extra support.
Can I improve my PNI score before hip fracture surgery?
Yes, PNI reflects nutritional status, so eating adequate protein and calories before surgery may help improve it. Aim for 1.2 to 1.5 grams of protein per kilogram of body weight daily. Discuss specific nutritional strategies with your doctor or a dietitian, as improvements take several weeks.
Is the PNI blood test better than other tests for predicting hip fracture outcomes?
In this study, PNI outperformed HALP (another similar nutritional test) as an independent predictor of survival. However, both tests showed only modest predictive power, meaning they work best as part of a complete medical assessment rather than alone. Your doctor should consider PNI alongside other clinical factors.
Who is most at risk after hip fracture surgery based on this research?
Elderly patients with low PNI scores, male gender, existing cancer, or multiple medical conditions face the highest mortality risk. If you have these risk factors, discuss enhanced monitoring and nutritional support with your healthcare team before and after surgery.
How soon after hip fracture surgery can doctors use PNI to assess my risk?
PNI can be measured from a blood test taken before surgery, providing immediate risk assessment. This allows doctors to plan enhanced care and monitoring from the start of your hospital stay, potentially improving outcomes through early intervention.
Want to Apply This Research?
- Track pre-surgery nutritional markers: log daily protein intake in grams, weight changes week-to-week, and any blood test results (albumin and lymphocyte counts if available). Set a goal of consuming 1.2 to 1.5 grams of protein per kilogram of body weight daily in the weeks before surgery.
- Users preparing for hip fracture surgery can use the app to plan high-protein meals, set reminders for nutritional supplements, and log their food intake to ensure adequate nutrition before the procedure. After surgery, continue tracking nutrition and recovery milestones to support healing.
- Create a pre-surgery nutrition plan with specific protein and calorie targets. After surgery, track recovery progress including mobility improvements, pain levels, and nutritional intake. Share this data with your healthcare team to guide rehabilitation decisions.
This article summarizes research findings and should not replace professional medical advice. If you are facing hip fracture surgery or have concerns about your nutritional status, consult with your physician, surgeon, or registered dietitian. Blood tests like PNI are tools to support clinical decision-making but should not be used alone to predict outcomes or guide treatment. Individual results vary based on many factors not captured in this study. Always discuss your specific situation with your healthcare team.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.