NIHSS Comprehensive

Retrospective Validation (2025): If scoring from records, map GCS and MRC scales per Alamri et al. Assign 1 point each to items 9 and 10 for ambiguous "slurred speech" documentation.

1a: Consciousness0

1b: Orientation0

1c: Commands0

2: Horizontal Gaze0

3: Visual Fields0

4: Facial Palsy0

5a: L-Arm Motor0

5b: R-Arm Motor0

6a: L-Leg Motor0

6b: R-Leg Motor0

7: Limb Ataxia0

8: Sensory0

9: Language0

10: Dysarthria0

11: Extinction0

Guidelines & Evidence

Verified

Last Review: 2026-07-17

When to Use

Standard of Care

Baseline quantification of neurological deficit in Acute Ischemic Stroke (AIS).

Primary tool for reperfusion eligibility (IV Thrombolysis / Thrombectomy).

Validated for patient handoff between ER and Neurology teams (Cummock, 2023).

Predicts hospital disposition and 3-month functional outcomes (mRS).

Assessment Timing

Perform at T0 (presentation), 2h post-reperfusion, 24h post-onset, and at discharge. A change of ±4 points is clinically significant, often requiring repeat imaging to rule out hemorrhagic transformation.

Chart Mapping (r-NIHSS)

The 2025 Standardized Mapping

If p-NIHSS is undocumented, use the following mapping for retrospective assessment (Alamri et al., 2025):

GCS & MRC Equivalents

NIHSS Item	Clinical Mapping (EHR Source)
1a: Consciousness	GCS E4=0; E3=1; E2=2; E1=3
1b: Orientation	GCS V5=0; V4=1; ≤V3=2
1c: Commands	GCS M6=0; M5=1; ≤M4=2
5/6: Motor Strength	MRC 5 or 4+=0; MRC 4=1; MRC 3=2; MRC 2/1=3; MRC 0=4
9/10: Speech	If "slurred" without detail, assign 1 to Aphasia AND 1 to Dysarthria

Last Comprehensive Review: 2026-07-17

In Recent Clinical News

Scanning Medical Journals

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NIHSS Comprehensive

When to Use

Standard of Care

Assessment Timing

Origins & History

Historical Context

Chart Mapping (r-NIHSS)

The 2025 Standardized Mapping

GCS & MRC Equivalents

Clinical Pearls

LVO Correlation

The Evidence

NIHSS Scoring Tool Utilizing Medical Records: Validation Study.

Reliability of NIHSS Between ER and Neurology Physicians.

The mNIHSS: Its Time Has Come.

In Recent Clinical News

NIHSS Comprehensive

When to Use

Standard of Care

Assessment Timing

Origins & History

Historical Context

Chart Mapping (r-NIHSS)

The 2025 Standardized Mapping

GCS & MRC Equivalents

Clinical Pearls

LVO Correlation

The Evidence

NIHSS Scoring Tool Utilizing Medical Records: Validation Study.

Reliability of NIHSS Between ER and Neurology Physicians.

The mNIHSS: Its Time Has Come.

In Recent Clinical News