HeartForms

Right & Left Heart Cath Calculator

Patient Metrics

Patient's height in centimeters.
Patient's weight in kilograms.
Patient's age in years. Determines which VO₂ formula to use.
Patient's heart rate in beats per minute. Normal Range: 60 - 100 bpm
Hemoglobin level in g/dL. Normal Range (Male): 13.5 - 17.5 g/dL Normal Range (Female): 12.0 - 15.5 g/dL
Peripheral capillary or aortic oxygen saturation. Normal Range: 95 - 100%
Cardiac Output measured directly by the thermodilution method.

Venous Oxygen Saturations (%)

Superior Vena Cava oxygen saturation. Normal Range: ~70%
Inferior Vena Cava oxygen saturation. Normal Range: ~75%
Right Atrium oxygen saturation.
Right Ventricle oxygen saturation.
Pulmonary Artery oxygen saturation (mixed venous). Normal Range: 60 - 80%

Pressure Values (mmHg)

Right Atrium 'a' wave pressure. Normal Range: 2 - 7 mmHg
Right Atrium 'v' wave pressure. Normal Range: 2 - 8 mmHg
Right Atrium mean pressure. Normal Range: 0 - 8 mmHg
Right Ventricle systolic pressure. Normal Range: 15 - 30 mmHg
Right Ventricle end-diastolic pressure. Normal Range: 0 - 8 mmHg
Pulmonary Artery systolic pressure. Normal Range: 15 - 30 mmHg
Pulmonary Artery diastolic pressure. Normal Range: 8 - 15 mmHg
Pulmonary Capillary Wedge 'a' wave pressure. Normal Range: 3 - 15 mmHg
Pulmonary Capillary Wedge 'v' wave pressure. Normal Range: 3 - 12 mmHg
Pulmonary Capillary Wedge mean pressure. Normal Range: 2 - 12 mmHg
Left Ventricle systolic pressure. Normal Range: 90 - 140 mmHg
Left Ventricle end-diastolic pressure. Normal Range: 5 - 12 mmHg
Aortic systolic pressure. Normal Range: 90 - 140 mmHg
Aortic diastolic pressure. Normal Range: 60 - 90 mmHg

Results

BMI:Body Mass Index A measure of body fat based on height and weight. Normal Range: 18.5 - 24.9 kg/m² Equation: Weight(kg) / [Height(m)]²
BSA:Body Surface Area (Mosteller) The total surface area of the human body, used to normalize measurements. Normal Range: 1.6 - 1.9 m² (highly variable) Equation: sqrt([Height(cm) * Weight(kg)] / 3600)
VO₂ (assumed):Assumed Oxygen Consumption The volume of oxygen consumed by the body, estimated from BSA. Equation (Age < 70): 125 * BSA Equation (Age ≥ 70): 110 * BSA
Fick CO:Cardiac Output (Fick) Blood flow calculated by the Fick principle. Normal Range: 4.0 - 8.0 L/min Equation: VO₂(mL/min) / [Hgb * 1.34 * (Art Sat% - PA Sat%) * 10]
Fick CI:Cardiac Index (Fick) Fick cardiac output normalized for body surface area. Normal Range: 2.5 - 4.0 L/min/m² Equation: Fick CO / BSA
Stroke Volume:Stroke Volume (from Fick CO) The volume of blood pumped from the left ventricle per beat. Normal Range: 60 - 100 mL/beat Equation: (Fick CO * 1000) / Heart Rate
SVC O₂ Sat:Oxygen saturation in the Superior Vena Cava.
IVC O₂ Sat:Oxygen saturation in the Inferior Vena Cava.
RA Pressure (a/v/m):Right Atrial pressure waves and mean. Normal Mean: 0-8 mmHg
RA O₂ Sat:Oxygen saturation in the Right Atrium.
RV Pressure (s/ed):Right Ventricular systolic and end-diastolic pressures. Normal Range: 15-30 / 0-8 mmHg
RV O₂ Sat:Oxygen saturation in the Right Ventricle.
PA Pressure (s/d/m):Pulmonary Artery Pressure The blood pressure within the pulmonary artery. Normal Range: 15-30 / 8-15 mmHg (Mean: 9-18 mmHg) Mean Equation: (1/3 * PA Sys) + (2/3 * PA Dia)
PA O₂ Sat:Pulmonary Artery (mixed venous) oxygen saturation.
PCWP (a/v/m):Pulmonary Capillary Wedge Pressure waves and mean. Normal Mean: 2-12 mmHg
LV Pressure (s/ed):Left Ventricular systolic and end-diastolic pressures. Normal Range: 90-140 / 5-12 mmHg
Aortic Pressure (s/d/m):Aortic Pressure The blood pressure within the aorta. Normal Range: 90-140 / 60-90 mmHg (Mean: 70-105 mmHg) Mean (MAP) Equation: (1/3 * Aortic Sys) + (2/3 * Aortic Dia)
PVR (Wood units):Pulmonary Vascular Resistance The resistance the pulmonary circulation offers to blood flow. Normal Range: < 3.0 Wood Units Equation: (PA Mean - PCWP Mean) / Fick CO
DPG (PADP - PCWP):Diastolic Pressure Gradient A DPG > 7 mmHg suggests pre-capillary PH. Normal Range: < 7 mmHg Equation: PA Diastolic - PCWP Mean
Thermo CO:Cardiac Output (Thermodilution) Cardiac output measured by the thermodilution method. Value is user-entered. Normal Range: 4.0 - 8.0 L/min
Thermo CI:Cardiac Index (Thermodilution) Thermodilution cardiac output normalized for body surface area. Normal Range: 2.5 - 4.0 L/min/m² Equation: Thermo CO / BSA

Disclaimer & Sources

The normal ranges provided in this calculator are for general educational purposes only and are based on typical values for adults at rest. These values can vary based on the individual, clinical context, and measurement technique. Always consult official clinical guidelines and institutional protocols for diagnostic and therapeutic decision-making.

Sources for Normal Values: