Use V/Q Mismatch Category when you need to classify a ventilation-perfusion ratio as shunt below 0.3, low up to 0.8, normal below 1.5, and dead-space otherwise. Enter Ventilation-perfusion ratio using the definitions and units below so the result can be reproduced.

Ventilation-perfusion ratio

A finite measured or assumed value greater than or equal to 0.

The published tool contract uses this rule: Classify a ventilation-perfusion ratio as shunt below 0.3, low up to 0.8, normal below 1.5, and dead-space otherwise.

Mismatch category

The calculated mismatch category.

The category is produced by fixed software thresholds. Those cutoffs may differ from a laboratory, field protocol, population, jurisdiction, or current professional guideline.

Retain the original Ventilation-perfusion ratio values and their units alongside the result. V/Q Ratio is useful when you instead need to compute the ventilation-perfusion ratio as alveolar ventilation divided by pulmonary blood flow. Alveolar Ventilation L/min provides another view by helping you compute alveolar ventilation in litres per minute as (tidal volume - dead space) x respiratory rate / 1000.

• V/Q Ratio

  Compute the ventilation-perfusion ratio as alveolar ventilation divided by pulmonary blood flow.

• Alveolar Ventilation L/min

  Compute alveolar ventilation in litres per minute as (tidal volume - dead space) x respiratory rate / 1000.

• HbA1c Category Lookup

  Classify a hemoglobin A1c percentage as normal below 5.7 percent, prediabetes below 6.5 percent, or diabetes otherwise.