OBI Medical

How does v-TACTM work?

v-TAC™ is a method implemented in software for calculation of arterial acid-base and blood gas status from measurements in the peripheral venous blood, in combination with an SpO2 measurement.

It is simple to operate v-TAC™ in daily clinical practice. After installation of the v-TAC™ software, the workflow is as follows:

1. Collect venous anaerobic blood sample by puncture or v-line

2. Measure simultaneously the SpO2 with a pulse oximeter

3. Enter the venous blood sample into the blood gas analyser and start the analysis (A)

4. Enter the measured SpO2 value (B)

5. Operate the blood gas analyser as usual

6. Obtain v-TAC™ calculated arterial blood gas values from a printer or laboratory system



Read more about how v-TAC™ works in the v-TAC™ Product Description here

When can v-TAC™ be used?

v-TAC™ can be used on patients age 18 and above with any clinical condition and who have been clinically assessed as showing sufficient peripheral perfusion. Indications include:

  • Stable and representative SpO2 can be measured
  • Peripheral limb is warm, red and dry
  • A pulse can be felt
  • Capillary response is normal.

v-TAC™ should not be used if:

  • There is difficulty measuring SpO2 (on the arm used for the sample)
  • The peripheral limb is cold/blue
  • There is a long stasis time for blood sampling
  • The patient develops catecholamines (or similar)

v-TAC™ cannot be used on patients with SpO2 below 75% (default is 80%).