Frequently Asked Questions

Arterial Hemoglobin Oxygen Saturation

Question: How is InSpectra™ StO₂ different from SpO₂ and SaO₂ ?

Base Deficit

Question: What is the relationship between InSpectra™ StO₂ and base deficit?

Bilirubin

Question: How does bilirubin affect the measurement of StO₂?

Blood Flow

Question: Can the InSpectra^TM StO₂ Tissue Oxygenation Monitor measure blood flow?

Blood Substitutes

Question: How is StO₂ affected by blood substitutes?

Edema

Question: How does edema affect StO₂?

Hypothermia

Question: How is StO₂ affected by hypothermia?

Lactate

Question: What is the relationship between InSpectra StO₂ and lactate?

Massive Blood Transfusion

Question: What is the utility of InSpectra™ StO₂ in Massive Blood Transfusion trauma patients?

Methemoglobin and Carboxyhemoglobin

Question: How do the presence of methemoglobin and carboxyhemoglobin affect InSpectra™ StO₂ Measurements?

Methylene Blue

Question: How does methylene blue affect InSpectra™ StO₂ and THI Measurements?

Myoglobin

Question: How is StO₂ affected by myoglobin?

Pulse Oximeters

Question: How Can Pulse Oximeters Claim to Measure Tissue Oxygenation?

StO₂ Higher than SpO₂

Question: Under what circumstances can StO₂ read higher than a pulse oximeter (SpO₂)?

THI Display

Question: What does the THI display mean and what can I do with it?

Vasoactive Medications

Question: How is StO₂ affected by vasoactive medications?

Venous Hemoglobin Oxygen Saturation

Question: How is InSpectra™ StO₂ different from SvO₂ and ScvO₂ ?