Blood sugar and hypertension grading
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Blood Sugar (Glucose) Classification & Hypertension Grading
Part 1: Blood Sugar (Glucose) Classification
Diagnostic Criteria for Diabetes Mellitus (ADA)
Diabetes is diagnosed if any one of the following criteria is met (in the absence of unequivocal hyperglycemia, two abnormal results from the same or separate samples are required):
| Test | Normal | Prediabetes | Diabetes |
|---|---|---|---|
| Fasting Plasma Glucose (FPG) | <100 mg/dL (<5.6 mmol/L) | 100-125 mg/dL (5.6-6.9 mmol/L) | ≥126 mg/dL (≥7.0 mmol/L) |
| 2-hr OGTT (75g oral glucose load) | <140 mg/dL (<7.8 mmol/L) | 140-199 mg/dL (7.8-11.0 mmol/L) | ≥200 mg/dL (≥11.1 mmol/L) |
| HbA1c | <5.7% | 5.7-6.4% | ≥6.5% (≥48 mmol/mol) |
| Random Plasma Glucose (with classic symptoms) | -- | -- | ≥200 mg/dL (≥11.1 mmol/L) |
- Tietz Textbook of Laboratory Medicine, 7th Edition; Robbins & Kumar Pathologic Basis of Disease
Prediabetes Categories
| Category | Criteria |
|---|---|
| Impaired Fasting Glucose (IFG) | FPG 100-125 mg/dL |
| Impaired Glucose Tolerance (IGT) | 2-hr OGTT 140-199 mg/dL |
| Borderline HbA1c | 5.7%-6.4% |
Prediabetes represents hyperglycemia insufficient for a diabetes diagnosis but significant as a risk factor for both future diabetes and cardiovascular disease. Progression from prediabetes to type 2 DM occurs at approximately 12% per year on average. - The Washington Manual of Medical Therapeutics
Key Testing Notes
- Glucose must be measured in venous plasma, not capillary blood from point-of-care devices
- Plasma should be separated from cells within 30 minutes of collection (or collected in a glycolysis inhibitor tube)
- HbA1c must be NGSP-certified and standardized to the DCCT assay
- Tietz Textbook of Laboratory Medicine, 7th Edition
Part 2: Hypertension Grading
There are two major classification systems in use globally. They differ in where hypertension begins.
A. ACC/AHA 2017 Classification (United States) - Fuster and Hurst's The Heart, 15th Edition
| Category | Systolic (mmHg) | Diastolic (mmHg) | |
|---|---|---|---|
| Normal | <120 | and | <80 |
| Elevated | 120-129 | and | <80 |
| Hypertension Stage 1 | 130-139 | or | 80-89 |
| Hypertension Stage 2 | ≥140 | or | ≥90 |
Key change: This 2017 guideline lowered the hypertension threshold to 130/80 mmHg (previously 140/90 mmHg under JNC 7) and eliminated the "prehypertension" term, replacing it with "elevated blood pressure."
B. ESC/ESH 2018 Classification (Europe) - Comprehensive Clinical Nephrology, 7th Edition
| Category | Systolic (mmHg) | Diastolic (mmHg) | |
|---|---|---|---|
| Optimal | <120 | and | <80 |
| Normal | 120-129 | and/or | 80-84 |
| High Normal | 130-139 | and/or | 85-89 |
| Grade 1 Hypertension | 140-159 | and/or | 90-99 |
| Grade 2 Hypertension | 160-179 | and/or | 100-109 |
| Grade 3 Hypertension | ≥180 | and/or | ≥110 |
| Isolated Systolic Hypertension | ≥140 | and | <90 |
The ESC/ESH system retains the classic threshold of 140/90 mmHg for hypertension and uses a 3-grade severity system. The ambulatory BP thresholds for diagnosis: daytime ≥135/85, nighttime ≥120/70, 24-hr average ≥130/80 mmHg.
C. Hypertensive Crises
When BP exceeds 180/120 mmHg, it is classified as a hypertensive crisis with two subtypes:
| Type | Definition |
|---|---|
| Hypertensive Urgency | BP >180/120 mmHg with no acute target organ damage; patient is asymptomatic |
| Hypertensive Emergency | BP >180/120 mmHg with acute or worsening target organ damage |
Target organ damage in emergency includes: acute MI, intracranial hemorrhage, pulmonary edema/heart failure, acute kidney injury, hypertensive encephalopathy, ischemic stroke, and aortic dissection. - Fuster and Hurst's The Heart, 15th Edition
D. Special Pediatric BP Categories (Children 1-12 years, percentile-based)
| Category | Threshold |
|---|---|
| Normal | <90th percentile |
| Elevated | ≥90th percentile or ≥120/80 to <95th percentile |
| Stage 1 Hypertension | ≥95th percentile to 95th + 12 mmHg, or 130/80-139/89 |
| Stage 2 Hypertension | ≥95th percentile + 12 mmHg, or ≥140/90 mmHg |
For children ≥13 years, the same adult thresholds apply (normal <120/80 mmHg). - Fuster and Hurst's The Heart, 15th Edition
Quick Comparison: ACC/AHA vs ESC/ESH
| BP (mmHg) | ACC/AHA (2017) | ESC/ESH (2018) |
|---|---|---|
| <120/80 | Normal | Optimal |
| 120-129/<80 | Elevated | Normal |
| 130-139/85-89 | Stage 1 HTN | High Normal |
| 140-159/90-99 | Stage 2 HTN | Grade 1 HTN |
| 160-179/100-109 | Stage 2 HTN | Grade 2 HTN |
| ≥180/≥110 | Crisis | Grade 3 HTN |
The practical takeaway: the ACC/AHA classifies more people as hypertensive (starting at 130/80), while ESC/ESH considers 130-139/85-89 as "high normal" - not yet requiring drug treatment in most cases.
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