Method for performing a non-invasive blood gas test

• US 7,291,502 B2
• Filed: 03/15/2006
• Issued: 11/06/2007
• Est. Priority Date: 03/15/2006
• Status: Expired due to Fees

• Current Assignee: Wayne P. Franco
• Original Assignee: Wayne P. Franco
• Inventors: Franco, Wayne P.
• Primary Examiner(s): Wallenhorst; Maureen M.
• Application Number:
  US11/375,905
• Publication Number:
  US 20070218559A1
• Time in Patent Office: 601 Days
• Field of Search: 436/63, 436/68, 436/163, 600/364, 702/19
• US Class Current: 436/68
• CPC Class Codes: A61B 5/14539 for measuring pH
• CPC Class Codes: A61B 5/14546 for measuring analytes not otherwise provided for, e.g. ions, cytochromes
• CPC Class Codes: A61B 5/14551 for measuring blood gases
• CPC Class Codes: A61B 5/416 the spleen
• CPC Class Codes: G01N 33/84 involving inorganic compounds or pH

Abstract

A non-invasive blood gas test is carried out by a method that utilizes a venous blood sample together with a pulse oximeter and a plurality of mathematical equations. The method generates the following data points of the blood: (i) the pH level; (ii) the [H+] concentration; (iii) the [HCO₃—] concentration; (iv) the partial pressure of carbon dioxide; and (v) the oxygen saturation level. Mathematical formulas, tables, and chemical equations provide a simple method by which a doctor or other medical professional can easily calculate the blood gas data without the need for an arterial blood sample or specialized machines. Blood gas measurements are obtained from a patient in a faster, safer and less painful manner than tests that require an arterial blood sample. In another embodiment of the present invention, a system for locating a dysfunctional organ in a patient is disclosed.

Claims

1. A method for performing a non-invasive blood gas test on a patient, comprising the steps of:

a) measuring the pH level of the patient'"'"'s venous blood;

b) calculating the level of [H+] concentration (represented in mol per liter) in the patient'"'"'s venous blood from extrapolating from the following table;

2. The method as recited by claim 1, wherein said calculating in steps b) and d), respectively, is performed by a hand-held calculator.

3. The method as recited by claim 1, wherein said calculating in steps b) and d), respectively, is performed by a computer program.

4. A method for performing a non-invasive blood gas test on a patient, comprising the steps of:

a) measuring the pH level of the patient'"'"'s venous blood;

b) calculating the level of [H+] concentration (represented in mol per liter) in the patient'"'"'s venous blood from the following formulas;

pH=−

log₁₀[H+]

[H+]=Antilog₁₀(−

pH)

c) measuring the level of serum bicarbonate concentration, [HCO₃—

] (in mEq/liter) in the patient'"'"'s venous blood;

d) calculating the partial pressure (in mm Hg) of carbon dioxide in the patient'"'"'s venous blood from the following formula;

PCO₂=[H+]×

(1/24)×

[HCO₃—

],

 

wherein [H+] is represented in nmol/L; and

e) determining the oxygen saturation level (SO₂) of the patient'"'"'s arterial blood by using a pulse oximeter.

5. The method as recited by claim 4, wherein said calculating in steps b) and d), respectively, is performed by a hand-held calculator.

6. The method as recited by claim 4, wherein said calculating in steps b) and d), respectively, is performed by a computer program.