Perioperative medicine & outcomes
Non-invasive measure of haemoglobin using the Rad-67™ pulse co-oxymeter in post- operative care unit to predict postoperative day 1 haemoglobin after major orthopaedic surgery, a prospective cohort study
Authors' conclusion
SpHb may help to reduce the need for blood samples and identify patients who should receive IV iron treatment after major orthopaedic surgery.
Study context
- Population
- Adults undergoing total hip or knee arthroplasty118 (86%) with POD1 haemoglobin (Hb)
- Participants
- 138 adults
- Outcome
- Ability of SpHb in the PACU to predict POD1 anaemia (POD1 Hb <12 g/dL)
- Follow-up
- POD1
Methodological detailssingle-centre, diagnostic accuracy (ROC analysis), logistic regression model
- Single-centre
- Diagnostic accuracy (ROC analysis)
- Logistic regression model
Main finding
As reported in the abstract
Prediction of POD1 anaemia
| Group | AUC |
|---|---|
| SpHb | 0.73 (95% CI: 0.63-0.82) |
SpHb
AUC0.73 (95% CI: 0.63-0.82)
Observational data: associations, not effects.
Further findings
Independent predictors of POD1 anaemia (logistic regression)
| OR (95% CI) | P value | ||
|---|---|---|---|
| WomenSex | 3.97 (1.8–9.97) | P = 0.003 | |
| Preoperative anaemia treatment | 0.10 (0.014–0.70) | P = 0.02 | |
| SpHb | 0.72 (0.55–0.95) | P = 0.02 | |
| 0.050.21520Odds ratio (log scale) |
SpHb thresholds
- SpHb <11.7 g/dL (n=16): POD1 anaemia
- 81%
- SpHb >14.9 g/dL (n = 31): Hb ≥12 g/dL
- 78%
- Applying thresholds could have safely eliminated need for blood sample
- 36%
Original publication
Non-invasive measure of haemoglobin using the Rad-67™ pulse co-oxymeter in post- operative care unit to predict postoperative day 1 haemoglobin after major orthopaedic surgery, a prospective cohort study. Anaesth Crit Care Pain Med. Published 4 October 2025. doi:10.
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