NIH Stroke Scale Calculator (NIHSS)

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Assess how alert the patient is. Choose the lowest level of consciousness that best describes their state.
Ask the patient the current month and their age. Score only the initial answer. Do not help. Dysarthric but otherwise correct answers count as correct.
Ask the patient to open and close their eyes, then to grip and release the non-paretic hand. Pantomime commands if language is a barrier.
Test horizontal eye movements only. If patient cannot follow commands, test by oculocephalic (doll's eye) reflex.
Test visual fields by confrontation using finger counting or visual threat in all four quadrants. Score symmetrical findings.
Ask the patient to show teeth or raise eyebrows and close eyes. Score the symmetry of the grimace. Use grimace if the patient is obtunded.
Extend the arm (palm down) 90 degrees if sitting, 45 degrees if supine. Count aloud and hold up fingers. Score the drift over 10 seconds. Use 0 for amputation or joint fusion.
Same as 5A but for the right arm. Extend the arm (palm down) 90 degrees if sitting, 45 degrees if supine. Score over 10 seconds.
Ask the supine patient to raise the left leg to 30 degrees and hold for 5 seconds. Count aloud and hold up fingers. Use 0 for amputation or joint fusion.
Same as 6A but for the right leg. Ask the supine patient to raise the right leg to 30 degrees and hold for 5 seconds.
Perform finger-nose-finger and heel-shin tests bilaterally. Score only if present out of proportion to weakness. Score 0 if paralyzed or if patient does not understand.
Test with pinprick on face, arm, trunk and leg. Score only loss attributed to stroke. Score 2 only for a clearly abnormal loss to pinprick or withdrawal from touch in coma.
Score language based on responses to all tests. For this item, score the best response. Ask the patient to name objects on a standard form, read sentences, and describe a picture.
Ask the patient to read or repeat several words. An intubated patient or one with a physical barrier scores 0. Do not tell the patient why they are being tested.
Test tactile/visual/auditory attention with bilateral simultaneous stimulation. Also assess personal neglect by having patient attend to the paretic side.
NIHSS Total ScoreNo stroke symptoms
0points

Sum of all 11 NIHSS items (range 0-42)

Stroke SeverityNo stroke symptoms
Maximum Possible Score42points
0 pts
No symptoms<1Minor1-5Moderate5-16Mod-Severe16-21Severe21+

NIHSS score: 0 - No stroke symptoms

  • A score of 0 indicates no detectable neurological deficit from stroke.
  • Symptom resolution does not rule out stroke. TIA patients may score 0.
  • Brain imaging (CT or MRI) should still be performed to evaluate for infarct or haemorrhage.
  • Serial NIHSS scoring tracks neurological improvement or deterioration over time.

Next stepThis calculator is an educational and documentation aid. Clinical management decisions must be made by qualified healthcare professionals using complete patient assessment.

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