Modified Aldrete Recovery Score Calculator

Five bedside observations, 0 to 2 each, scored in the recovery room. The total is a record of physiological recovery from anaesthesia and nothing more — it was never validated against any adverse outcome, and it is not a discharge authorisation.

Last updated 8 Oct 2026

Modified Aldrete score

5 items → 0–10

ActivityOn command, voluntarily. The item was written for residual neuromuscular blockade and general anaesthesia, and it reads badly after a regional block: a patient with a working spinal moves two extremities and scores 1 for a reason that has nothing to do with incomplete recovery. That is a known limitation of the score rather than a finding about the patient.

Respiration“Coughs freely” is the operative phrase and is doing more work than it looks: an effective cough is the test of whether the airway can be protected. A patient breathing comfortably who cannot cough on request scores 1, not 2.

CirculationThis is the item where published reproductions disagree, and the option labels above are deliberately neutral because of it. Two independent reproductions give the bands as a percentage of the pre-anaesthetic blood pressure — within 20 per cent, 20 to 49 per cent, 50 per cent or more — and two give them as a difference in mmHg — within 20 mmHg, 20 to 50 mmHg, more than 50 mmHg. The two readings coincide when the baseline is about 100 mmHg and diverge otherwise: at a baseline of 160, 20 per cent is 32 mmHg. Use whichever your own recovery-room chart specifies, and know which one it is. See mean arterial pressure.

ConsciousnessA three-level item, which is far coarser than the Glasgow Coma Scale and is not trying to compete with it. It cannot distinguish sedation from delirium, and an agitated, disoriented patient who is wide awake scores 2 — which is one of several reasons the total is not a summary of whether the patient is well.

Oxygen saturationThis item is what the 1995 revision added, replacing the original 1970 score’s assessment of skin colour — which is the single biggest difference between the original and the modified score. Reproductions disagree here too: the labels above follow the two sources that agree with each other, while a third renders the 1-point level as above 92 per cent on supplemental oxygen and a fourth sets the 2-point level at above 90 rather than 92 per cent on air. The gap between 90 and 92 per cent on room air is therefore scored differently by different charts.

8pointsExample

Moves all four limbs; breathes deeply and coughs freely; blood pressure moderately off the pre-anaesthetic level; arousable on calling; saturation above 92 per cent on air

Scoring

Modified Aldrete = activity + respiration + circulation + consciousness + oxygen saturation, each 0 to 2
Maximum 10. The conventional recovery-room figure quoted in the literature is 9 or more

what the total is, and is not: a structured record that five aspects of recovery from anaesthesia have been looked at. It is not a validated predictor of anything: the score was published without an outcome study, and we could find no derivation cohort, sensitivity, specificity or c-statistic for it, because none was ever reported. A score with no stated discrimination is a checklist with arithmetic attached, and that is a fair description of this one
the 1970 original and the 1995 revision: Aldrete and Kroulik’s 1970 score assessed activity, respiration, circulation, consciousness and colour. The 1995 revision replaced colour with pulse-oximeter oxygen saturation, which is the whole of the difference and the reason the current version is called modified. A chart that still scores colour is the 1970 score
two items where sources disagree: we could not read the 1995 article itself. Four independent reproductions that all cite it agree on the five items and the 0 to 2 scoring, and disagree on two descriptors: circulation as a percentage of baseline blood pressure (two sources) or as a difference in mmHg (two sources), and three different renderings of the saturation item. Both circulation readings are printed, and the option labels on this page are deliberately neutral so that the arithmetic does not commit to one
what it has no item for: pain, nausea and vomiting, surgical bleeding, shivering, urinary retention, delirium, temperature and the ability to walk. A patient can score ten while vomiting, and that is not a defect in the score so much as a statement of its scope — later discharge criteria exist precisely because this one stops at physiological recovery from the anaesthetic
after regional anaesthesia: the activity item was written for general anaesthesia and residual neuromuscular blockade. A patient with a working spinal or an effective lower-limb block cannot move four extremities and scores 1 for a reason that has nothing to do with incomplete recovery, so the ceiling is 9 until the block regresses

Worked example

Moves all four limbs; breathes deeply and coughs freely; blood pressure moderately off the pre-anaesthetic level; arousable on calling; saturation above 92 per cent on air
Activity 2 + respiration 2 + circulation 1 + consciousness 1 + saturation 2 = 8 points
8 is below the conventional figure of nine or more that the literature quotes for recovery-room discharge
Two items are at 1, so the total has lost two points from two different places. The number 8 does not say which, and the two situations call for different things
Let the blood pressure settle and the total becomes 9. Let the patient wake fully instead and it also becomes 9 — the same total from two different recoveries
There are exactly five ways to score 9, and all five are four full marks and one item at 1. So a 9 always means one specific thing is still imperfect, and reading the total alone hides which
A patient needing oxygen to hold a saturation above 90 per cent also scores 9, with everything else perfect. Whether that is a patient ready to leave a recovery room is a judgement about the patient, not about the number
This page computes the score. Nothing on it authorises a discharge, and the score has never been validated against any outcome that would let it

The five items

The circulation row prints both readings in circulation because the four reproductions we could read split two and two, and the 1995 article itself was not available to us. They coincide at a baseline of about 100 mmHg and diverge at the extremes, so a hypertensive patient is scored differently by the two versions.
Item	2 points	1 point	0 points
Activity	Moves all four extremities	Moves two extremities	Moves none
Respiration	Breathes deeply and coughs freely	Dyspnoeic, shallow or limited breathing	Apnoeic
Circulation	Blood pressure within 20 per cent (two sources) or 20 mmHg (two sources) of the pre-anaesthetic level	20 to 49 per cent, or 20 to 50 mmHg, off baseline	50 per cent or more, or more than 50 mmHg, off baseline
Consciousness	Fully awake	Arousable on calling	Not responding
Oxygen saturation	Above 92 per cent on room air	Needs supplemental oxygen to maintain above 90 per cent	Below 90 per cent even with supplemental oxygen

Every way to score 9, and why the total is not enough

Five entirely different patients, one number. That is the argument for recording the items rather than the total, and it is why no threshold on this page is described as a decision: the score has never been shown to separate safe from unsafe recovery, because no study was ever done to find out.
Which item is at 1	Total	What the patient is actually like
Activity	9	Moving only two limbs — or has a working regional block
Respiration	9	Breathing shallowly, or cannot cough on request
Circulation	9	Blood pressure still some way off baseline
Consciousness	9	Only arousable when called by name
Oxygen saturation	9	Needs supplemental oxygen to stay above 90 per cent

A checklist with arithmetic attached, and that is all right

Aldrete and Kroulik published a post-anaesthetic recovery score in 1970: five observations — activity, respiration, circulation, consciousness and skin colour — each scored 0, 1 or 2, for a maximum of 10. The 1995 revision replaced colour with pulse-oximeter oxygen saturation, and that single substitution is the whole of what “modified” means. Both versions are still in use, and a recovery chart that scores colour is the 1970 one.

What this score has never had is an outcome study. We could find no derivation cohort, no sensitivity or specificity, no c-statistic and no published demonstration that any total separates a safe recovery from an unsafe one, because none appears to have been reported. The figure of nine or more that recovery-room protocols quote is a convention attributed to the 1995 revision, not a validated cut-off. That is worth saying plainly, because it is the opposite of how the number is usually treated: a score that cannot be shown to predict anything is a structured prompt to look at five things, and its value is in the looking rather than in the arithmetic.

The structure of the score makes this concrete. There are exactly five ways to reach nine, and every one of them is four items at full marks and a single item at 1. So a nine always means precisely one thing is still imperfect — and the total conceals which. A patient who needs oxygen to hold a saturation above 90 per cent scores nine. So does a patient who is only arousable when called by name. So does a patient whose blood pressure is still well off baseline. Those are three different situations sharing one number, and the item scores, not the total, are the useful record.

Two further limits are worth knowing. The score has no item for pain, nausea and vomiting, surgical bleeding, shivering, urinary retention, delirium or temperature, so a patient can reach ten while being sick — which is why separate criteria exist for the later step of discharge home, and why the Apfel score is a separate page. And the activity item was written for general anaesthesia: a patient with a working spinal cannot move four extremities and scores 1 for a reason that has nothing to do with incomplete recovery, capping the total at nine until the block regresses. A published minimum is a population-level threshold, not a measurement of this patient. This page reports published figures and recommends no action.

Frequently asked questions

What is the modified Aldrete score?

Five observations made in the recovery room — activity, respiration, circulation, consciousness and oxygen saturation — each scored 0, 1 or 2, giving a total out of 10. The 1995 modification replaced the original 1970 score’s assessment of skin colour with pulse-oximeter saturation.

What Aldrete score is needed for discharge from recovery?

Recovery-room protocols conventionally quote nine or more, attributed to Aldrete’s 1995 revision. It is important to be clear about what that figure is: a convention, not a validated cut-off. No outcome study establishing that nine separates safe from unsafe recovery appears to have been published, and discharge is governed by the unit’s own criteria and the clinician assessing the patient.

How accurate is the Aldrete score?

There is no published figure, which is itself the answer. We could find no derivation cohort, sensitivity, specificity or c-statistic for it, because the score was published without an outcome study. It is a structured record of five observations rather than a validated predictor, and the five item scores carry more information than the total does.

Why do different charts score the circulation item differently?

Because published reproductions of the 1995 article disagree. Two independent sources give the bands as a percentage of the pre-anaesthetic blood pressure — within 20 per cent, 20 to 49 per cent, 50 per cent or more — and two give them as a difference in mmHg. The two readings coincide at a baseline near 100 mmHg and diverge at the extremes, so a hypertensive patient can score differently on two charts that both cite the same paper.

Does the Aldrete score work after a spinal or a regional block?

Poorly, and predictably so. The activity item asks whether the patient moves all four extremities, which a working spinal or lower-limb block prevents, so the total is capped at nine for a reason unrelated to recovery from the anaesthetic. The item was written for general anaesthesia and residual neuromuscular blockade.

Related calculators

References

Aldrete JA. The post-anesthesia recovery score revisited. J Clin Anesth. 1995;7(1):89–91.
Aldrete JA, Kroulik D. A postanesthetic recovery score. Anesth Analg. 1970;49(6):924–934.
Joshi GP, Abdelmalak BB, Weigel WA, et al. 2023 American Society of Anesthesiologists practice guidelines for preoperative fasting: carbohydrate-containing clear liquids with or without protein, chewing gum, and pediatric fasting duration. Anesthesiology. 2023;138(2):132–151.

Not medical advice. For healthcare professionals and education. Reference intervals vary by laboratory and assay — always use your own laboratory's. Never base a dose or a treatment decision on this page alone. Full disclaimer at calcengines.com/disclaimer/