https://clincalcpro.com/ Free clinical calculators, drug doses, decision pathways and AI clinical decision support for working clinicians. en Thu, 28 May 2026 21:51:08 GMT 1440 https://clincalcpro.com/calculators/vascular/age_adjusted_ddimer/ https://clincalcpro.com/calculators/vascular/age_adjusted_ddimer/ In patients ≥50 years with low-to-moderate pre-test probability of PE or DVT, D-dimer threshold is increased using the formula: age × 10 µg/L (or × 10 ng/mL). This increases specificity while maintaining sensitivity, reducing unnecessary imaging. Validated by ADJUST-PE and multiple meta-analyses. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/vascular/dutch_criteria_fh/ https://clincalcpro.com/calculators/vascular/dutch_criteria_fh/ Validated scoring system for diagnosing familial hypercholesterolaemia (FH) based on family history, personal history, physical examination, LDL-cholesterol levels, and DNA analysis. Score ≥8 = definite FH. NICE and EAS recommended. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/vascular/simon_broome_fh/ https://clincalcpro.com/calculators/vascular/simon_broome_fh/ UK criteria for diagnosing familial hypercholesterolaemia (FH). Requires total cholesterol >7.5 mmol/L (or LDL >4.9 mmol/L in adults) PLUS either tendinous xanthomata in patient/relative OR known mutation. Used by NICE CG71 for FH identification. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/vascular/villalta_score/ https://clincalcpro.com/calculators/vascular/villalta_score/ Clinical scoring tool for diagnosis and severity grading of post-thrombotic syndrome (PTS) following deep vein thrombosis (DVT). 5 patient symptoms + 6 clinician signs, each scored 0–3. Total 0–33. Score ≥5 = PTS; score ≥15 or presence of ulcer = severe PTS. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/vascular/medped_fh_us/ https://clincalcpro.com/calculators/vascular/medped_fh_us/ US diagnostic criteria for FH based on total cholesterol levels adjusted for age and relationship to a known FH proband (Make Early Diagnoses — Prevent Early Deaths programme). Widely used in North America for FH cascade screening. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/vascular/vascular_abi_index/ https://clincalcpro.com/calculators/vascular/vascular_abi_index/ Diagnoses and grades severity of peripheral arterial disease (PAD). ABI = ankle systolic BP / brachial systolic BP. Predicts cardiovascular risk. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/vascular/critical_limb_ischaemia/ https://clincalcpro.com/calculators/vascular/critical_limb_ischaemia/ Assesses features of critical limb ischaemia using Rutherford/SVS classification. Guides urgency of revascularisation. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/vascular/aaa_rupture_risk/ https://clincalcpro.com/calculators/vascular/aaa_rupture_risk/ Estimates annual rupture risk of abdominal aortic aneurysm (AAA) based on diameter. Guides surveillance and surgical planning. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/vascular/wound_healing_score/ https://clincalcpro.com/calculators/vascular/wound_healing_score/ Pressure Ulcer Scale for Healing (PUSH) assesses wound size, exudate, and tissue type to monitor healing progress. Used for chronic wounds including pressure ulcers and venous leg ulcers. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/vascular/carotid_stenosis_nascet/ https://clincalcpro.com/calculators/vascular/carotid_stenosis_nascet/ Classifies carotid artery stenosis severity and guides endarterectomy vs stenting vs medical management based on NASCET criteria. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/vascular/venous_clinical_severity_vcss/ https://clincalcpro.com/calculators/vascular/venous_clinical_severity_vcss/ Quantifies severity of chronic venous disease using 10 attributes. Guides treatment escalation from compression to intervention. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/vascular/peripheral_bypass_vsg_risk/ https://clincalcpro.com/calculators/vascular/peripheral_bypass_vsg_risk/ Estimates 30-day mortality and morbidity risk for lower extremity bypass surgery. Based on Vascular Study Group NSQIP model. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/vascular/rutherford_pad/ https://clincalcpro.com/calculators/vascular/rutherford_pad/ Standard staging system for chronic lower-extremity ischaemia (Rutherford 1997). Categories 0–6 from asymptomatic to major tissue loss. Used alongside ABPI and Fontaine to guide intervention timing per ESVS 2024 and NICE CG147. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/vascular/ceap_classification/ https://clincalcpro.com/calculators/vascular/ceap_classification/ Clinical class (C0–C6) of the CEAP system (Eklöf et al. 2004, revised 2020). Aetiology / Anatomy / Pathophysiology assessed separately. Drives compression, ablation, and ulcer-care decisions. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/vascular/fontaine_pad/ https://clincalcpro.com/calculators/vascular/fontaine_pad/ Four-stage European staging of chronic lower-limb ischaemia (Fontaine 1954). Complements Rutherford. Used in ESVS guidance. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/vascular/tasc_ii/ https://clincalcpro.com/calculators/vascular/tasc_ii/ Trans-Atlantic Inter-Society Consensus II anatomic classification of peripheral arterial lesions (Norgren 2007). Guides endovascular vs open surgical revascularisation. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/vascular/hardman_ruptured_aaa/ https://clincalcpro.com/calculators/vascular/hardman_ruptured_aaa/ Five preoperative variables predicting in-hospital mortality after open repair of ruptured AAA (Hardman 1996). Each scored 1. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/vascular/glasgow_aneurysm/ https://clincalcpro.com/calculators/vascular/glasgow_aneurysm/ Predicts perioperative mortality in elective and ruptured AAA repair (Samy 1994). GAS = age + 17(shock) + 7(MI) + 10(CVD) + 14(renal disease). Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/aa_gradient/ https://clincalcpro.com/calculators/respiratory/aa_gradient/ Calculates the alveolar-arterial oxygen gradient to assess for V/Q mismatch and diffusion defects. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/pefr_percent/ https://clincalcpro.com/calculators/respiratory/pefr_percent/ Calculates peak expiratory flow rate as percentage of predicted to classify asthma severity. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/psi_port/ https://clincalcpro.com/calculators/respiratory/psi_port/ Predicts 30-day mortality in community-acquired pneumonia. Simplified from the full Fine/PORT score. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/bode_index/ https://clincalcpro.com/calculators/respiratory/bode_index/ Predicts mortality in COPD using BMI, airflow obstruction, dyspnoea, and exercise capacity. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/mmrc_dyspnoea/ https://clincalcpro.com/calculators/respiratory/mmrc_dyspnoea/ Grades breathlessness severity to guide COPD management and pulmonary rehabilitation referral. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/lights_criteria/ https://clincalcpro.com/calculators/respiratory/lights_criteria/ Distinguishes exudative from transudative pleural effusions using protein and LDH ratios. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/fev1_ratio/ https://clincalcpro.com/calculators/respiratory/fev1_ratio/ Interprets spirometry FEV₁/FVC ratio to classify airflow obstruction severity per GOLD criteria. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/pesi/ https://clincalcpro.com/calculators/respiratory/pesi/ Predicts 30-day mortality in acute PE to guide disposition (inpatient vs outpatient management). Validated in multiple large cohorts. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/spesi/ https://clincalcpro.com/calculators/respiratory/spesi/ Simplified version of PESI using 6 binary variables to predict 30-day mortality after acute PE. Easier to calculate bedside than the original PESI. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/hestia_criteria/ https://clincalcpro.com/calculators/respiratory/hestia_criteria/ 11 clinical criteria to determine if a patient with acute PE is safe for outpatient (home) treatment. If ANY criterion is met, outpatient treatment is NOT recommended. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/years_algorithm/ https://clincalcpro.com/calculators/respiratory/years_algorithm/ Stepwise algorithm combining 3 clinical items with D-dimer to exclude PE. Uses lower D-dimer threshold (500 μg/L) when ≥1 YEARS item present, higher threshold (1000 μg/L) when no YEARS items. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/padua_score/ https://clincalcpro.com/calculators/respiratory/padua_score/ Estimates VTE risk in hospitalised medical patients to guide thromboprophylaxis decisions. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/stop_bang/ https://clincalcpro.com/calculators/respiratory/stop_bang/ Screens for moderate-to-severe obstructive sleep apnoea (OSA) using 8 binary questions. Used pre-operatively and in outpatient settings. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/winters_formula/ https://clincalcpro.com/calculators/respiratory/winters_formula/ Predicts the expected compensatory pCO₂ for a primary metabolic acidosis. A measured pCO₂ outside this range indicates a co-existing respiratory disorder. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/pao2_fio2/ https://clincalcpro.com/calculators/respiratory/pao2_fio2/ Calculates the ratio of arterial oxygen tension to inspired oxygen fraction. Used to classify severity of hypoxaemic respiratory failure and diagnose ARDS per Berlin criteria. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/crb65/ https://clincalcpro.com/calculators/respiratory/crb65/ Simplified pneumonia severity score not requiring urea measurement. Used in community and primary care settings to guide admission decisions in CAP. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/smart_cop/ https://clincalcpro.com/calculators/respiratory/smart_cop/ Predicts need for intensive respiratory or vasopressor support (IRVS) in community-acquired pneumonia. Identifies patients who may require ICU-level care. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/rapid_pleural/ https://clincalcpro.com/calculators/respiratory/rapid_pleural/ Predicts 3-month mortality in patients with pleural infection (empyema/complicated parapneumonic effusion) to guide management intensity. Validated in the MIST2 trial cohort. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/ariscat/ https://clincalcpro.com/calculators/respiratory/ariscat/ Predicts risk of postoperative pulmonary complications (atelectasis, respiratory failure, pleural effusion, pneumonia, pneumothorax, bronchospasm) in non-cardiac surgery patients. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/oxygen_content/ https://clincalcpro.com/calculators/respiratory/oxygen_content/ Calculates total arterial oxygen content — oxygen bound to haemoglobin plus dissolved in plasma. Used to assess oxygen delivery (DO₂ = CaO₂ × CO × 10). Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/d_dimer_age/ https://clincalcpro.com/calculators/respiratory/d_dimer_age/ Calculates the age-adjusted D-dimer threshold for excluding PE in patients over 50. Reduces unnecessary CTPA in elderly patients with low-to-moderate pre-test probability. Formula: age × 10 μg/L. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/gold_copd/ https://clincalcpro.com/calculators/respiratory/gold_copd/ GOLD 2023 ABCD assessment tool for COPD combining symptom burden (CAT/mMRC) and exacerbation history to guide therapy. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/berlin_ards/ https://clincalcpro.com/calculators/respiratory/berlin_ards/ 2012 Berlin Definition of ARDS. Classifies severity by PaO₂/FiO₂ ratio with PEEP ≥ 5 cmH₂O. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/cat_copd/ https://clincalcpro.com/calculators/respiratory/cat_copd/ 8-item patient-reported outcome measure quantifying COPD symptom impact on daily life. Validated for GOLD ABCD grouping. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/fleischner_criteria/ https://clincalcpro.com/calculators/respiratory/fleischner_criteria/ 2017 Fleischner Society guidelines for management of incidentally discovered pulmonary nodules on CT in adults ≥ 35 years. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/spn_mayo/ https://clincalcpro.com/calculators/respiratory/spn_mayo/ Estimates probability of malignancy in a solitary pulmonary nodule (SPN) using 6 independent predictors. Validated in multiple cohorts. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/abg_interpretation/ https://clincalcpro.com/calculators/respiratory/abg_interpretation/ Stepwise interpretation of arterial blood gas. Identifies primary acid-base disorder and degree of compensation. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/wells_pe_score/ https://clincalcpro.com/calculators/respiratory/wells_pe_score/ Pre-test probability score for pulmonary embolism. Guides decisions regarding D-dimer testing and CT pulmonary angiography (CTPA) in suspected PE. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/geneva_score_revised_pe/ https://clincalcpro.com/calculators/respiratory/geneva_score_revised_pe/ Revised Geneva Score for pre-test probability of pulmonary embolism. Fully objective score using only clinical and laboratory variables — no physician gestalt required. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/bova_score_pe/ https://clincalcpro.com/calculators/respiratory/bova_score_pe/ Risk stratification tool for intermediate-risk (haemodynamically stable) PE patients. Identifies those at risk of PE-related complications and death within 30 days. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/curb65_pneumonia/ https://clincalcpro.com/calculators/respiratory/curb65_pneumonia/ Severity scoring for community-acquired pneumonia (CAP). Guides decision between outpatient, inpatient, and ICU care. British Thoracic Society standard score. Calculator Sun, 17 May 2026 20:38:59 GMT https://clincalcpro.com/calculators/respiratory/hamilton_dvt_score/ https://clincalcpro.com/calculators/respiratory/hamilton_dvt_score/ Predicts probability of deep vein thrombosis (DVT) in outpatients. An alternative to the Wells DVT score with similar performance. Calculator Sun, 17 May 2026 20:38:59 GMT